BMC Public Health, Volume 20, No. 1, Year 2020
PLoS ONE, Volume 4, No. 10, Year 2009
BMC women's health, Volume 21, No. 1, Year 2021
AIDS, Volume 21, No. 10, Year 2007
PLoS ONE, Volume 8, No. 9, Year 2013
Bulletin of the World Health Organization, Volume 85, No. 4, Year 2007