1. a HIV Center for Clinical and Behavioral StudiesNew York State Psychiatric Institute and Columbia University , New York
2. b The Miriam Hospital
3. c The Warren Alpert Medical School of Brown University , Providence , Rhode Island
4. f Statistical Center for HIV/AIDS Research & Prevention, Fred Hutchinson Cancer Research Center , Seattle, Washington
5. d University of Pennsylvania , Philadelphia , Pennsylvania
6. e Columbia University , New York
7. g Fenway Community Health