BMJ Global Health, Volume 3, No. 2, Year 2018
PLoS ONE, Volume 8, No. 12, Year 2013
PLoS Medicine, Volume 13, No. 8, Year 2016
BMJ Global Health, Volume 3, No. 3, Year 2018
BMC Pregnancy and Childbirth, Volume 14, No. 1, Year 2014