1. Epidemiology Department, Gillings School of Global Public Health, University of North Carolina at Chapel Hill , Chapel Hill, NC , USA
2. Duke Global Health Institute, Duke University , Durham, NC , USA
3. Harvard Global Health Institute, Harvard University , Cambridge, MA , USA
4. Kenya Medical Research Institute , Nairobi , Kenya
5. Department of Obstetrics and Gynecology, Duke University School of Medicine , Durham, NC , USA