1 *Department of Epidemiology and Biostatistics, The University of Western Ontario, London, Ontario, Canada †The Global Forum on MSM and HIV, Oakland, CA ‡Community Health Systems and the Department of Medicine, University of California San Francisco, San Francisco, CA §San Francisco Department of Public Health, San Francisco, CA ‖The International Center for AIDS Care and Treatment Programs (ICAP) and the Department of Socialmedical Sciences, Mailman School of Public Health, Columbia University, New York, NY.