1. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada.
2. Clinical Prevention Services, British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada.
3. British Columbia Centre on Substance Use, Vancouver, British Columbia, Canada.
4. Community-Based Research Centre, Vancouver, British Columbia, Canada.
5. Interdisciplinary Studies Graduate Program, University of British Columbia, Vancouver, British Columbia, Canada.
6. School of Public Health and Social Policy, University of Victoria, Victoria, British Columbia, Canada.