1. The Global Forum on MSM & HIV (MSMGF), 436 14th Street, Suite 1500, Oakland, CA 94612, USA
2. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA, USA
3. San Francisco Department of Public Health, San Francisco, CA, USA
4. Center for AIDS Prevention Studies, University of California, San Francisco, San Francisco, CA, USA
5. Mailman School of Public Health, Columbia University, New York, NY, USA
6. Urban Health Program, RTI International, San Francisco, CA, USA