1. Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, Georgia.
2. Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington.
3. Department of Global Health, University of Washington, Seattle, Washington.
4. Center for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya.
5. Department of Obstetrics and Gynecology, University of Nairobi, Nairobi, Kenya.
6. International Training and Education Center on HIV (I-TECH), University of Washington, Seattle, Washington.
7. Department of Community Health and Centre for HIV Prevention and Research, University of Nairobi, Nairobi, Kenya.