1. Vanderbilt University School of Medicine, Nashville, Tennessee.
2. Johns Hopkins University, Baltimore, Maryland.
3. Yale School of Medicine, New Haven, Connecticut.
4. VA Connecticut Healthcare System, West Haven, Connecticut.
5. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.
6. University of North Carolina, Chapel Hill, North Carolina.
7. Universidad Central del Caribe, Bayamon, Puerto Rico.
8. Mid-Atlantic Permanente Research Institute, Rockville, Maryland.
9. Harvard Medical School, Boston, Massachusetts.
10. University of Alabama at Birmingham, Birmingham, Alabama.
11. Kaiser Permanente Northern California, Oakland, California.
12. Alberta HIV Clinic, Sheldon M. Chumir Health Centre, Calgary, Alberta, Canada.
13. McGill University Health Center, Montreal, Quebec, Canada.
14. University of Washington, Seattle, Washington.