Affiliation: | 1. British Columbia Centre on Substance Use, Vancouver, Canada;2. British Columbia Centre on Substance Use, Vancouver, Canada Department of Medicine, University of British Columbia, Vancouver, Canada;3. British Columbia Centre on Substance Use, Vancouver, Canada School of Population and Public Health, University of British Columbia, Vancouver, Canada;4. School of Population and Public Health, University of British Columbia, Vancouver, Canada British Columbia Centre for Disease Control, Vancouver, Canada |