Article Text

The impact of criminalisation on abortion-related outcomes: a synthesis of legal and health evidence
  1. Fiona de Londras1,2,
  2. Amanda Cleeve3,
  3. Maria Isabel Rodriguez4,
  4. Alana Farrell5,
  5. Magdalena Furgalska6,
  6. Antonella Lavelanet7
  1. 1Birmingham Law School, University of Birmingham, Birmingham, UK
  2. 2ANU College of Law, Australian National University, Canberra, Australian Capital Territory, Australia
  3. 3Womens and Childrens Health, Karolinska Institute, Stockholm, Sweden
  4. 4Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon, USA
  5. 5Birmingham Law School, University of Birmingham, Birmingham, Birmingham, UK
  6. 6York Law School, University of York, York, UK
  7. 7Department of Sexual and Reproductive Health and Research and UNDP-UNFPA-UNICEF-WHO-World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), World Health Organization, Geneve, Switzerland
  1. Correspondence to Professor Fiona de Londras; f.delondras{at}bham.ac.uk

Abstract

Abortion is criminalised to at least some degree in most countries. International human rights bodies have recognised that criminalisation results in the provision of poor-quality healthcare goods and services, is associated with lack of registration and unavailability of essential medicines including mifepristone and misoprostol, obstructs the provision of abortion information, obstructs training for abortion provision, is associated with delayed and unsafe abortion, and does not achieve its apparent aims of ether protecting abortion seekers from unsafe abortion or preventing abortion. Human rights bodies recommend decriminalisation, which is generally associated with reduced stigma, improved quality of care, and improved access to safe abortion. Drawing on insights from reproductive health, law, policy, and human rights, this review addresses knowledge gaps related to the health and non-health outcomes of criminalisation of abortion. This review identified evidence of the impacts of criminalisation of people seeking to access abortion and on abortion providers and considered whether, and if so how, this demonstrates the incompatibility of criminalisation with substantive requirements of international human rights law. Our analysis shows that criminalisation is associated with negative implications for health outcomes, health systems, and human rights enjoyment. It provides a further underpinning from empirical evidence of the harms of criminalisation that have already been identified by human rights bodies. It also provides additional evidence to support the WHO’s recommendation for full decriminalisation of abortion.

  • Public Health

Data availability statement

All data relevant to the study are included in the article or uploaded as online supplemental information.

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WHAT IS ALREADY KNOWN ON THIS TOPIC

  • Existing studies establish the impacts on abortion care, abortion seekers and abortion providers when abortion is criminalised. Meanwhile, doctrinal studies in international human rights law show increased awareness of the incompatibility of criminalisation with a range of rights including the right to privacy and the right to health.

WHAT THIS STUDY ADDS

  • Using an innovative methodology that integrates international human rights law and public health research, this study substantiates the material ways in which criminalisation impacts on abortion seekers and health workers and thus concretises human rights implications. It shows the impact of criminalisation not only of pregnant people who seek abortion, but across the spectrum of availing of, providing, and assisting with abortion care.

HOW THIS STUDY MIGHT AFFECT RESEARCH, PRACTICE OR POLICY

  • This paper provides evidence of the incompatibility of criminalisation with aspirations for the maximisation of health outcomes and the realisation of human rights. In doing so, it demonstrates health and human rights imperatives for decriminalisation as a matter of legal and policy change.

Introduction

Criminalisation can be understood as the application of criminal law to some or all persons who seek, access, provide (including medication), assist with, are aware of, or believe someone to have accessed abortion (UN Special Rapporteur, paras. 21–36).1 Where abortion is criminalised, the criminal law is used to regulate abortion, and those who have, provide, or support with availing of consensual abortion may be arrested, investigated and/or prosecuted (although in some settings the law is not actively applied). Abortion is criminalised in most countries.2 In some settings general offences (such as manslaughter or murder) are applied to people who avail of, provide or assist with accessing abortion either in addition to offences specific to abortion or as a way of criminalising abortion in practice. In some settings having an abortion is a crime, while in others the pregnant person does not commit a crime but those who assist her or provide abortion to her do. Even in jurisdictions where abortion is available on broad grounds, abortion may still be criminalised or criminal sanctions may apply to other synonyms for abortion including ‘termination of pregnancy’, ‘destruction of unborn human life’, ‘procurement of a miscarriage’ or ‘menstrual regulation’.2

In many settings criminalisation of abortion is a legacy of 19th century regulatory approaches, often residual from colonial-era laws.3 Criminalisation does not align with either the human rights of abortion seekers or providers, or the realities of contemporary abortion care, which is safe, effective and not harmful.4 Key human rights institutions have stated that criminalisation results in the provision of poor-quality healthcare goods and services (UN Special Rapporteur, para. 32),1 is associated with lack of registration and unavailability of essential medicines including mifepristone and misoprostol, obstructs the provision of abortion information (UN Special Rapporteur, paras. 21–36; Human Rights Committee),1 5 obstructs training for abortion provision (UN Special Rapporteur, paras. 21–36),1 is associated with delayed and unsafe abortion (UN Special Rapporteur, paras. 21–36; Human Rights Committee, para 20; Human Rights Council, paras. 93–95),1 6 7 and does not achieve its apparent aims of either protecting abortion seekers from unsafe abortion or preventing abortion.1 6 7 Meanwhile, public health scholars generally associate decriminalisation with reduced stigma, improved quality of care and improved access to safe abortion.8

There is now a consensus in international human rights law that criminal abortion laws jeopardise the health and life of abortion seekers (UN Special Rapporteur; Human Rights Committee, para. 8; CEDAW Committee, para. 31(c)),1 9 10 are discriminatory (Human Rights Council, paras. 46, 50, 90; Human Rights Council, paras. 49–51),11 12 and violate human rights protections (Human Rights Council, paras. 93–95).7 As a result, human rights institutions increasingly take the view that abortion should be decriminalised.13–15 While these sources do not tend to provide a comprehensive definition of decriminalisation, when we speak of decriminalisation we refer to the full decriminalisation of abortion for women, providers and assistants through the removal of abortion and all abortion-related offences from the criminal law and penal code, and the non-application of other offences (like manslaughter or murder) to those who access, provide, or assist with availing of abortion.

In this review, we aim to address knowledge gaps that relate to health and non-health outcomes associated with the criminalisation of abortion. In particular, we seek to assess whether, how and to what extent evidence from included studies demonstrates empirically the rights violations that are associated with criminalisation. The review was designed in accordance with a methodology for integrating human rights in guideline development that we have described elsewhere.16 This methodology is appropriate for complex interventions, including laws and policies, which may have have multiple components interacting synergistically, have non-linear effects, or are context dependent.17 Complex interventions of this kind often interact with one another, meaning that outcomes related to one individual or community may be dependent on others, and that they might be positively or negatively impacted by the arrangements of people, institutions and resources within a larger implementation system.17 This is one of seven reviews with the same methodological approach that was conducted as part of developing the evidence base for WHO’s Abortion Care Guideline.18

Throughout this review, we use the terms women, girls, pregnant women (and girls), pregnant people and people interchangeably to include all those with the capacity for pregnancy.

Methods

Patient and public involvement

The nature of this research did not require or enable the involvement of patients or the public, although criminalisation was identified as a law and policy intervention for consideration within the broader process of guideline development at a scoping meeting that took place in Geneva. The participants in this meeting are listed in the Abortion Care Guideline (WHO, p. 122).18

Identification of studies and data extraction

This review examined the impact of criminalisation on two populations: (1) people seeking abortion and (2) healthcare providers. Law, policy, and human rights scholars and practitioners worked together to develop the search strategy and outcomes of interest. We searched in English for a combination of MeSH terms and keywords.

Searches were conducted in PubMed, HeinOnline and JStor and the search engine Google Scholar. As the second edition of the WHO’s Safe Abortion: technical and policy guidance for health systems (2012) included data up until 2010, we limited our search to papers published in English after 2010 to 2 December 2019. We undertook an updated search of the same databases in July 2021. We aimed to locate papers that included original data and analysis on the connections (direct and indirect) between criminalisation of abortion and our outcomes of interest. We included a wide range of study types, including (comparative and non-comparative) quantitative studies, qualitative and mixed-methods studies, reports, PhD theses and economic or legal analyses that undertook original data collection or analysis. Following a preliminary assessment of the literature,19 we identified health and non-health outcomes of interest that could be linked to the effects of criminalisation. The identified outcomes of interest were delayed abortion, opportunity costs (understood widely as including, inter alia, financial and health harms), self-managed abortion, workload implications, system costs, perceived imposition on personal ethics or conscience, perceived impact on relationship with patient, referral to another provider, unlawful abortion, continuation of pregnancy, and stigmatisation.

There were six members of the review team (MF, AF, FdL, AC, MIR and AL). Two reviewers (MF and AF) conducted an initial screening of the literature. Titles and abstracts were first screened for eligibility using the Covidence tool; full texts were then reviewed. A third reviewer (FdL) confirmed that these manuscripts met inclusion criteria. Two reviewers (FdL and AC) extracted data. Any discrepancies were reviewed and discussed with two additional reviewers (AL and MIR). The review team resolved discrepancies through consensus.

Consistent with our methodology for integrating human rights in reviews that underpin evidence bases for guideline development,16 we analysed international human rights law relevant to reproductive rights to identify applicable (hard and soft) legal standards. These were standards that referred either expressly to the criminalisation of sexual and reproductive healthcare including abortion, or outlined states’ general obligations vis-à-vis sexual and reproductive healthcare as they could be applied to the criminalisation of abortion. As described elsewhere,16 this included a systematic analysis of sources such as treaties, general comments, opinions of treaty monitoring bodies and reports of special procedures. Having undertaken the searches and full-text review, we integrated the evidence from the studies and from international human rights law to develop a full understanding of the law and policy implications for our outcomes of interest of criminalisation of abortion. In applying human rights standards to the data extracted from these manuscripts, we sought to identify which human rights standards are engaged by criminalisation, and whether this evidence suggests that criminalisation has positive or negative effects on the enjoyment of rights. Where the manuscripts did not contain any data relevant to the outcomes of interest, we considered whether human rights law provided evidence that could further explicate the impacts and effects of criminalisation.

Analysis

Using evidence tables described in our methodology,16 we presented data from the included studies as relevant to our outcomes of interest. In these tables, we presented both the association of each finding with the outcome of interest and an overall conclusion of the identified findings across the body of evidence. Following this, we applied the identified human rights standards to these outcomes thus combining the evidence from human rights law and the included studies to develop an understanding of the effects of criminalisation of abortion. This allowed us to assess whether the evidence from the included studies indicated effects of criminalisation that were incompatible with international human rights law.16 Across all study designs, we used and applied a visual representation of effect direction to summarise the effect of the intervention, with symbols indicated whether the evidence extracted from a study suggested an increase (▲), decrease (⊽), or no change (○) to the outcome of interest, but not indicating magnitude of the effect.16

Results

The initial search generated 47 285 citations after duplicates were removed. We screened the titles and abstracts and conducted a full-text screening of 426 manuscripts. We excluded those manuscripts that did not have a clear connection with the intervention and our predefined outcomes, resulting in 28 manuscripts being included in the final analysis (figure 1).

Figure 1

PRISMA flow diagram. *Consider, if feasible to do so, reporting the number of records identified from each database or register searched (rather than the total number across all databases/registers). **If automation tools were used, indicate how many records were excluded by a human and how many were excluded by automation tools. From: Page et al.62 PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.

Manuscripts described data from the following 19 settings: Australia,20–22 Brazil,23 Chile,24 25 El Salvador,26 Ethiopia,27 Ireland28–30 Lebanon,31 Mexico,32–37 Nepal,38 Northern Ireland,28 39 Palestine,40 Philippines,41 Rwanda,42 Senegal,43 Sri Lanka,44 Tanzania,27 Uganda,45 Uruguay and46 47 Zambia.27 The characteristics of included manuscripts are presented in table 1. The included studies contained information relevant for the outcomes: delayed abortion24 29 39 continuation of pregnancy,32 36 46 47 opportunity costs,21 22 24–26 28 29 31 33 37 39–44 self-managed abortion,24 28 39 41 unlawful abortion,24 28 31 35 37 39–42 44 45 criminal justice procedures against women23 24 26 27 37 45 and healthcare professionals,20 21 24 30 41 45 workload implications,20 21 42 43 referral to another provider,29 40 perceived impact on relationship with patient,22 24 29 antiabortion ‘sting’ operations,21 42 availability of trained providers,21 29 41 reporting of suspected unlawful abortions,23–27 29 35 41–43 and system cost.24 29 31 32 34 36 38 40 41 45–47 No evidence was identified linking the intervention to the outcomes harassment of healthcare providers and stigmatisation of healthcare providers. As might be expected in a review of this kind, and as becomes clear in the results described below, some findings are repeated across outcomes of interest.

Table 1

Characteristics of included studies

Impact of criminalisation on abortion seekers

A summary of the impacts of the intervention on abortion seekers and the application to human rights are presented in table 2. Evidence identified per study and outcome is presented in online supplemental table 1.

Supplemental material

Table 2

Impact of criminalisation on abortion seekers

Evidence from three studies suggests that criminalisation contributes to abortion delay.24 29 39 Specifically, healthcare professionals may delay provision where women are experiencing complications to be sure that they ‘qualify’ under limited exceptions to criminal offences.29 One study also demonstrates that criminalisation complicates the care pathway by forcing women to travel out of country or rely on telemedicine services; care pathways on which medications may be confiscated during transport, delivery may be prolonged, and there may be resultant delays in accessing care.39 While delay in accessing abortion does not per se constitute a human rights violation, delays associated with criminalisation may engage states’ obligations to take steps to reduce maternal mortality and morbidity and to address delayed and unsafe abortion,1 6 7 not least because of the requirement to ensure abortion regulation is evidence based and proportionate.1 Evidence from four studies suggests that criminalisation indirectly contributes to increased continuation of pregnancy32 36 46 47 by identifying the impact of decriminalisation on birth rates. These studies suggest that decriminalisation is associated with decreased birth rates in women aged between 20 and 29,36 20 and 34,47 and 15 and 4432 years of age. One study identifies a more marked trend towards reduced fertility among adolescents following decriminalisation,32 while another found little effect on adolescent birth rates in a setting where parental authorisation requirements continued to apply post-decriminalisation.36 Evidence from one study suggests that decriminalisation was not associated with a change in adolescent birth rates.46

Evidence from 16 studies suggests that criminalisation contributes to opportunity costs. We understand opportunity costs widely as including travel to access abortion, delayed and poor-quality post-abortion care, distress, financial burdens, stigma and exploitation.21 22 24–26 28 29 31 33 37 39–44 These opportunity costs impact disproportionately on certain populations of women and girls such as single women and women from socioeconomically disadvantaged groups31 and those accessing care in public rather than private healthcare sectors.25 Accordingly, the right to equality and non-discrimination in sexual and reproductive healthcare is engaged (Human Rights Council, paras. 46, 50, 90; CEDAW Committee, paras. 49–51),11 12 and these differential impacts appear not to be proportionate or evidence based.1 Additionally, two studies suggest that, despite generating fear among some pregnant women, criminalisation does not impact the decision to have an abortion.37 44 Four studies suggest that criminalisation contributes to self-managed abortion,24 28 39 41 which is sometimes unsafe24 41 and sometimes unlawful,24 28 39 while 11 studies suggest that it contributes to unlawful abortions,24 28 31 35 37 39–42 44 45 some of which are unsafe and lead to death.35 In one study, women reported avoiding seeking care from health facilities or trained providers because of the criminalisation of abortion,44 while another study revealed in criminalised settings that fear of litigation among healthcare providers contributes to denial of abortion and subsequent recourse to unlawful abortion.42 While some self-managed abortions may be unlawful, not all are, just as not all unlawful abortions are self-managed, however, as both occur outside of the formal health system, they may be less safe. Accordingly, this evidence illustrates that criminalisation of abortion appears incompatible with the human rights obligation to protect the health and life of abortion seekers (UN Special Rapporteur; Human Rights Committee, para. 8; CEDAW Committee, para. 31(c)).1 9 10

The evidence outlined in this section indicates clearly that criminalisation is incompatible with states’ obligation to take steps to prevent and reduce maternal mortality and morbidity and to protect women from unsafe abortion outlined above. In some cases, the criminalisation of abortion can result in violations of the right to life, and human rights bodies have made it clear that women should not be criminalised for accessing abortion.1 6 7 9–12 Illustrating that criminalisation can result in women who have abortions coming into contact with the criminal justice system, evidence from three studies shows that criminal justice procedures are initiated against women who seek abortion,23 24 26 although one further study suggests this is rare,27 and two further studies show that women who avail of abortion fear criminal justice repercussions.37 45

Impact of criminalisation on healthcare providers

A summary of the impacts of the intervention on health professionals and the application of human rights are presented in table 3. Evidence identified per study and outcome is presented in online supplemental table 2.

Table 3

Impact of criminalisation on abortion providers

Evidence from four studies suggests that criminalisation has increased workload implications for healthcare providers associated with complex regulations and ensuring they do not put themselves or their patients at risk of investigation or prosecution.20 21 42 43 This can involve what physicians considered to be unnecessary referrals to psychiatrists and other physicians for second opinions to establish compliance with exceptions to abortion criminalisation,20 the provision of detailed written statements justifying abortion provision in specific cases to manage risk of prosecution,21 and the exercise of particular caution when preparing paperwork and case files.42 43 Two studies suggest that referral pathways and practices are complicated by criminalisation,29 40 and three studies show that criminalisation negatively impacts the relationship between provider and patient.22 24 29 Physicians perceived criminalisation to have such negative impacts because they consider they cannot provide optimal care due to criminalisation,29 must undertake reporting24 and experience patients being wary and sometimes dishonest in interactions because of their apprehension of the criminal law.22

While evidence from only one study indicates that criminal justice proceedings are taken against abortion information providers,24 evidence from five studies suggests that healthcare providers anticipate criminal justice procedures against them resulting from their clinical practice,20 21 30 41 45 and two studies indicate that criminalisation leads to hesitancy in providing care.30 41 Evidence from two studies suggests that criminalisation contributes to healthcare providers’ apprehension of being subject to antiabortion sting operations,21 42 in one case reportedly resulting in health workers providing abortion care clandestinely.42 Combined with the findings from human rights bodies that criminalisation results in a ‘chilling effect’ in the provision of healthcare, with negative implications for the rights to life, health and privacy of women who seek abortion care,5 13 this evidence points clearly to the negative effects of criminalisation.

Overall, evidence from three studies suggests that criminalisation contributes to lower availability of trained providers and a loss of relevant skills.21 29 41 As a matter of international human rights law states are required to ensure that sexual and reproductive healthcare is available, accessible, acceptable and of good quality to protect, respect and fulfil the right to health.48 If, as these studies suggest, criminalisation contributes to a reduction in trained and available abortion care providers this has implications for the extent to which the state is fulfilling these obligations. While evidence from two studies indicate that healthcare providers generally do not report women to authorities,27 43 evidence from eight studies suggests that some healthcare providers report or would report a woman suspected of an induced abortion and consider themselves bound to do so.23–26 29 35 41 42 This reveals the ways in which criminalisation operates incompatibly with international human rights law, which makes it clear that states may not require healthcare professionals to report people for accessing abortion1 6 and that postabortion care must always be available regardless of the legal status of abortion.1 9 11 The combination of the evidence from these studies and applicable international legal standards points clearly to the negative impacts of criminalisation. Overall, evidence from 10 studies suggests that criminalisation contributes to system costs ranging from increased maternal mortality and morbidity, to creating a black market for abortion medication, delaying postabortion care, and distorting record keeping,24 29 31 32 34 36 38 40 41 45–47 with clear implications for the fulfilment of the right to health.48

Discussion

As outlined above, international human rights law requires states to take steps to ensure women do not have to undergo unsafe abortion, to reduce maternal morbidity and mortality, and to effectively protect women and girls from the physical and mental risks associated with unsafe abortion. Yet, the evidence from this review suggests that criminalisation has implications for access to safe abortion, as well as for the experience of seeking and availing of abortion care. Under international human rights law, states are required to revise their laws to ensure that in practice, the regulation of abortion does not jeopardise women’s lives, subject women or girls to physical or mental pain or suffering constituting torture or cruel, inhuman or degrading treatment or punishment, discriminate against women or girls, or interfere arbitrarily with their privacy.9 Thus, the evidence from this review reinforces the human rights imperative for full decriminalisation of abortion in all settings.

Reflecting the recognition across legal and health scholarship and domestic and international human rights law that criminalisation is not a sound regulatory approach to abortion, full or partial decriminalisation is beginning to occur. In some countries, parliaments have recently made legislative changes to remove criminal offences for women who access or avail of abortion, although providing abortion outside of the circumstances laid down in the law remains an offence.49 In others, parliaments have fully decriminalised abortion, although that is rare,50–52 and several superior courts have found that criminalisation of accessing or availing of abortion is unconstitutional.53 However, partial decriminalisation or practices of depenalisation or non-application of the law are insufficient as the open, informed and positive provision of abortion care remains hindered (Erdman and Cook, p. 13),54 and there are continuing impacts on health workers and healthcare facilities where provision of abortion remains criminalised. Health professionals increasingly express support for either full or partial decriminalisation, regardless of personal religious or ethical stance vis-à-vis abortion per se,55 and there is growing acknowledgement of the harms that are produced by abortion criminalisation (Erdman, p. 249).56 Formal decriminalisation does not necessarily create clarity in the community about the permissibility of abortion,57 suggesting that formal decriminalisation ought to be accompanied by government facilitating the provision of accurate and accessible information about the availability of abortion in a variety of formats and languages and in-keeping with the right to receive accurate and unbiased information on sexual and reproductive healthcare as reflected in, for example, Article 19 of the International Covenant on Civil and Political Rights.5 58 59

It is important to recall that in many jurisdictions criminalisation interacts with other abortion law and policy that may compound its effects, including the existence of grounds (which usually operate as exceptions or ‘defenses’ to general abortion-related offences). ‘Grounds-based’ access to abortion emerged to mitigate the effects of criminalisation, permitting abortion in limited circumstances. However, such restrictions, laws and policies not only themselves produce negative human rights effects including those resulting from delay, disproportionate impact on marginalised groups and denial of abortion even in circumstances where international human rights law makes clear it must be available, but also complicate abortion provision and health system organisation, create burdens within the criminal justice system, and contribute to the exceptionalisation and stigmatisation of abortion for both pregnant people and health workers.60 These broader effects combine with the human rights and public health impact of criminalisation outlined in this review to establish the significant burdens produced by criminalisation.

Limitations

This review has limitations. While its geographical scope is wide, with manuscripts reflecting 19 country contexts, the review only contains manuscripts published in English. Further research on the impact of criminalisation in a wider range of settings would be welcome. Furthermore, research on the impact of criminalisation of particular subpopulations of abortion seekers including people with diminished capacity and minors would benefit the overall evidence base. As a general matter, randomised controlled trials or comparative observational studies are not readily applicable to questions relating to the realisation of human rights applicable to abortion-related interventions, and studies do not always contain comparisons. Although this may be considered a limitation from a standard methodological perspective for systematic reviews, it does not impact on our ability to identify human rights law implications of law and policy interventions and thus is not a limitation for a review of this kind. Relatedly, standard tools for assessing risk of bias or quality, including GRADE,61 were unsuitable for this review which aimed to ensure effective integration of human rights into our understanding of the effects of criminalisation as a regulatory intervention in abortion law and policy. Thus, as explained in the published methodology,16 a wide variety of sources is engaged with.

Conclusion

This review identified evidence of the impacts of criminalisation on people seeking to access abortion and on abortion providers, and considered whether, and if so how, this demonstrates the incompatibility of criminalisation with substantive requirements of international human rights law. This review clearly points to impacts that have negative implications for health outcomes, health systems and human rights. It provides empirical evidence of the scale, complexity and severity of human rights violations associated with criminalisation and which have already been identified by human rights bodies. It also provides additional evidence to support the WHO’s recommendation for full decriminalisation of abortion, understood as ‘the complete decriminalisation of abortion for all relevant actors: removing abortion from all penal/criminal laws, not applying other criminal offences (eg, murder, manslaughter) to abortion, and ensuring there are no criminal penalties for having, assisting with, providing information about or providing abortion’.18 Given this, the need for states to fully decriminalise of abortion as a necessary step towards ensuring that abortion is available, accessible and of good quality is now firmly established.

Data availability statement

All data relevant to the study are included in the article or uploaded as online supplemental information.

Ethics statements

Patient consent for publication

References

Supplementary materials

  • Supplementary Data

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Footnotes

  • Handling editor Seye Abimbola

  • Twitter @fdelond

  • FdL, AC, MIR, AF, MF and AL contributed equally.

  • Contributors AL managed and is guarantor for the study. AL and FdL designed the review. AF and MF identified and extracted studies. AC and MIR analysed the data. AC undertook visualisation. FdL prepared the draft manuscript and revisions. All authors reviewed and approved the manuscript and revision.

  • Funding This work was supported by the UNDP‐UNFPA‐UNICEF‐WHO‐World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), a cosponsored programme executed by the WHO (AL) (https://www.who.int/teams/sexual-and-reproductive-health-and-research-(srh)/human-reproduction-programme). Professor FdL also acknowledges the support of the Leverhulme Trust through the Philip Leverhulme Prize (FdL) https://www.leverhulme.ac.uk.

  • Disclaimer The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

  • Competing interests None declared.

  • Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.