1. Ontario HIV Treatment Network, Toronto, ON, Canada
2. School of Social Work, McGill University, Montreal, QC, Canada
3. BC Centre on Substance Use, Vancouver, BC, Canada
4. Interdisciplinary Studies Graduate Program, University of British Columbia, Vancouver, BC, Canada
5. Lakehead Social Planning Council, Thunder Bay, ON, Canada
6. Department of Medicine, University of British Columbia, Vancouver, BC, Canada