1. Department of Maternal and Child Health, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
2. Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
3. ICAP at Columbia University, Mailman School of Public Health, Columbia University, New York, NY, USA
4. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
5. Center for Collaboration in Health, Maputo, Mozambique