1. British Columbia Centre for Excellence in HIV/AIDS, St. Paul's Hospital, 1081 Burrard Street, Vancouver, British Columbia V6Z 1Y6, Canada,
2. Department of Medicine, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, British Columbia V6Z 1Y6, Canada,
3. School of Population and Public Health, University of British Columbia, 5804 Fairview Avenue, Vancouver, British Columbia V6T 1Z3, Canada,
4. Sex Workers United Against Violence, Vancouver, British Columbia, Canada,
5. Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada.