1. The Fenway Institute, Fenway Health, Boston, Massachusetts, USA.
2. HIV/AIDS Bureau, Health Resources and Services Administration, Rockville, Maryland, USA.
3. AIDS United, Washington, District of Columbia, USA.
4. Center for AIDS Prevention Studies, University of California, San Francisco, California, USA.
5. Boston University School of Public Health, Boston, Massachusetts, USA.
6. Bouve College of Health Sciences, Northeastern University, Boston, Massachusetts, USA.
7. Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
8. Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.
9. Department of Psychiatry, Harvard Medical School, Boston, Massachusetts, USA.