1. British Columbia Centre on Substance Use, Vancouver, Canada.
2. UCLA Cannabis Research Initiative, Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California, USA.
3. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California, USA.
4. Division of Social Medicine, Department of Medicine, University of British Columbia, St. Paul's Hospital, Vancouver, Canada.
5. School of Population and Public Health, University of British Columbia, Vancouver, Canada.
6. Department of Psychology, University of British Columbia, Kelowna, Canada.
7. Faculty of Health Sciences, Simon Fraser University, Burnaby, Canada.