1. Massachusetts General Hospital, Division of Infectious Diseases, Boston, United States
2. Massachusetts General Hospital, Medical Practice Evaluation Center, Boston, United States
3. Massachusetts General Hospital, Biostatistics Center, Boston, United States
4. AIDS Healthcare Foundation, Durban, South Africa
5. RAND Corporation, Santa Monica, United States
6. Harvard University, Center for AIDS Research (CFAR), Boston, United States
7. Harvard Medical School, Boston, United States