1. University of Washington Seattle WA
2. University of Pennsylvania Philadelphia PA
3. Rutgers School of Public Health Rutgers University Piscataway NJ
4. Johns Hopkins University Baltimore MD
5. Yale University New Haven CT
6. Kaiser Permanente Northern California Oakland CA
7. Retrovirus Research Center Universidad Central del Caribe Bayamon Puerto Rico
8. Kaiser Permanente Mid‐Atlantic States Rockville MD
9. University of California, San Diego La Jolla CA
10. University of British Columbia Vancouver BC Canada
11. University of Calgary Calgary AB Canada
12. Vanderbilt University Medical Center Nashville TN
13. Philadelphia Field Initiating Group for HIV Trials Philadelphia PA
14. University of California San Francisco San Francisco CA
15. McGill University Health Centre Montréal QC Canada