Table 1

Selected characteristics of reviewed publications

Identified studies
#%
Year published
 Before 201010.5%
 201062.9%
 2011188.7%
 2012178.2%
 2013209.7%
 20143014.5%
 20153818.4%
 20165727.5%
 2017*209.7%
Region
 Africa4521.7%
 USA5024.2%
 South-East Asia199.2%
 Europe21.0%
 Eastern Mediterranean2612.6%
 Western Pacific94.3%
 Multiple3818.4%
 NA188.7%
Article type
 Systematic review3617.4%
 Non-systematic review178.2%
 Primary research (all)12761.4%
Primary research - quantitative 8541.1%
Primary research - qualitative 199.2%
Primary research - mixed methods 2311.1%
 Conceptual literature2713.0%
  • *the search concluded on 31 May, 2017.

  • NA, not available.