1. Department of Global Health, University of Washington, Seattle, WA 98195, USA.
2. Department of Medicine, University of Washington, Seattle, WA 98195, USA.
3. Department of Epidemiology, University of Washington, Seattle, WA 98195, USA.
4. Department of Pediatrics, University of Washington, Seattle, WA 98195, USA.
5. Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA.
6. Wits Institute for Reproductive Health and HIV, University of the Witwatersrand, Johannesburg 2001, South Africa.
7. Department of Epidemiology and Biostatistics, Makerere University, Kampala, Uganda.
8. Department of Obstetrics and Gynaecology, University of Nairobi, Nairobi, Kenya.
9. Vaccine and Infectious Disease Institute, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
10. Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.