1. Massachusetts General Hospital, Division of Infectious Diseases, Boston, MA, USA
2. Massachusetts General Hospital, Medical Practice Evaluation Center, Boston, MA, USA
3. Center for AIDS Research (CFAR), Harvard University, Boston, MA, USA
4. Harvard Medical School, Boston, MA, USA
5. Africa Health Research Institute, Durban, South Africa
6. Massachusetts General Hospital, Biostatistics Center, Boston, MA, USA
7. AIDS Healthcare Foundation, Durban, South Africa
8. South Africa Department of Health, Pietermaritzburg, South Africa
9. RAND Corporation, Santa Monica, CA, USA