1. 1U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland;
2. 2The Uniformed Services University of the Health Sciences, Bethesda, Maryland;
3. 3Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland;
4. 4HJF Medical Research International, Mbeya, Tanzania;
5. 5U.S. Army Medical Research Directorate-Africa, Abuja, Nigeria;
6. 6U.S. Army Medical Research Directorate-Africa, Nairobi, Kenya;
7. 7Makerere University Walter Reed Project, Kampala, Uganda;
8. 8U.S. Department of Health and Human Services, Nairobi, Kenya;
9. 9HJF Medical Research International, Kericho, Kenya