USAID:10.2105/AJPH.72.8.835
USAID:10.2105/AJPH.87.6.1012
USAID:10.2105/AJPH.92.1.19
USAID:10.2105/AJPH.2008.144709
USAID:10.2105/AJPH.2011.300242
USAID:10.2105/AJPH.2012.300704
USAID:10.2105/AJPH.2016.303474