1. British Columbia Centre on Substance Use, Vancouver, British Columbia, Canada.
2. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
3. UCLA Cannabis Research Initiative, Jane and Terry Semel Institute for Neuroscience and Human Behavior, Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California, USA.
4. Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada.