1. David Geffen School of Medicine at UCLA, Los Angeles, California.
2. RTI International, San Francisco, California.
3. Department of Global Health, University of Washington, Seattle, Washington.
4. Department of Medicine, University of Washington, Seattle, Washington.
5. Institute of Tropical and Infectious Diseases, University of Nairobi, Nairobi, Kenya.
6. Department of Medicine, Global Health and Epidemiology, University of Washington, Seattle, Washington.
7. Center for Studies in Demography and Ecology, University of Washington, Seattle, Washington.