1. Department of Global Health, University of Washington, Seattle, Washington.
2. Department of Medicine, University of Washington, Seattle, Washington.
3. Department of Pediatrics, University of Washington, Seattle, Washington.
4. Department of Biostatistics, University of Washington, Seattle, Washington.
5. Department of Epidemiology, University of Washington, Seattle, Washington.
6. Laboratory Medicine, University of Washington, Seattle, Washington.
7. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington.
8. Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, Republic of South Africa.
9. Department of Medicine, Indiana University, Indianapolis, Indiana.
10. Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom.
11. Department of Microbiology, University of Washington, Seattle, Washington.