1. Duke Global Health Institute; Duke University; Durham NC USA
2. Center for Microbiology Research; Kenya Medical Research Institute; Nairobi Kenya
3. Department of Obstetrics, Gynecology and Reproductive Sciences; University of California; San Francisco CA USA
4. Department of Epidemiology and Biostatistics; University of North Carolina; Chapel Hill NC USA
5. Department of Epidemiology and Biostatistics; University of California; San Francisco CA USA
6. Department of Obstetrics and Gynecology; Aga Khan University; Nairobi Kenya
7. Departments of Global Health and Obstetrics and Gynecology; University of Washington; Seattle WA USA