1. Laboratory of Immunoregulation, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Baltimore, Maryland.
2. Johns Hopkins University School of Medicine, Baltimore, Maryland.
3. Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland.
4. Rakai Health Sciences Program, Rakai, Uganda.
5. Makerere University School of Medicine, Kampala, Uganda.
6. Makerere University School of Public Health, Kampala, Uganda.