1. The Fenway Institute, Fenway Health, Boston, MA, USA
2. Harvard Medical School, Boston, MA, USA
3. HIV Prevention Research, Beth Israel Deaconess Hospital, Boston, MA, USA
4. Kaiser Permanente Center for Health Research, Portland, OR, USA
5. University of Washington, Seattle, WA, USA
6. Multnomah County Community Health Center, Portland, OR, USA
7. Howard Brown Community Health Center, Chicago, IL, USA
8. Asian Health Services, Oakland, CA, USA
9. Chase Brexton Health Care, Baltimore, MD, USA