BMJ Open, Volume 8, No. 10, Year 2018
Reproductive Health, Volume 14, No. 1, Year 2017
BMC Public Health, Volume 11, Year 2011
BMC Public Health, Volume 21, No. 1, Year 2021
PLoS ONE, Volume 7, No. 2, Year 2012
PLoS ONE, Volume 10, No. 11, Year 2015