1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington.
2. Department of Biostatistics, University of Washington, Seattle, Washington.
3. Department of Medicine, University of Washington, Seattle, Washington.
4. Department of Laboratory Medicine, University of Washington, Seattle, Washington.
5. HIV Prevention Research Unit, South African Medical Research Council, Durban, South Africa.
6. Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom.
7. Department of Global Health, University of Washington, Seattle, Washington.
8. Biostatistics Unit, Medical Research Council of South Africa, Cape Town, South Africa.
9. Institute for Global Health and Infectious Diseases, University of North Carolina, Chapel Hill, North Carolina.
10. Perinatal HIV Research Unit, University of the Witwatersrand, Chris Hani Baragwanath Academic Hospital, Johannesburg, South Africa.
11. Office of the President, South African Medical Research Council, Cape Town, South Africa.