RT Journal Article SR Electronic T1 Evaluating potential unintended consequences of COVID-19 vaccine mandates and passports JF BMJ Global Health JO BMJ Global Health FD BMJ Publishing Group Ltd SP e009759 DO 10.1136/bmjgh-2022-009759 VO 7 IS 7 A1 Maxwell J Smith YR 2022 UL http://gh.bmj.com/content/7/7/e009759.abstract AB