1. Rakai Health Sciences Program, Kalisizo, Uganda
2. Uganda Virus Research Institute, Entebbe, Uganda.
3. Medical Research Council/Uganda Virus Research Institute & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda.
4. Makerere University School of Public Health, Kampala, Uganda.
5. Johns Hopkins University School of Medicine, Department of Medicine, Baltimore, Maryland, USA.
6. Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.
7. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.