1. FHI 360, Health Services Research Division, Durham, NC, USA;
2. FHI 360, Behavioral, Epidemiological & Clinical Sciences Division, Durham, NC, USA;
3. FHI 360, Reproductive, Maternal, Newborn & Child Health Division, Durham, NC, USA;
4. Friends in Global Health, Maputo, Mozambique;
5. Vanderbilt University Medical Center, Vanderbilt Institute for Global Health, Nashville, TN, USA