1. Department of Family Practice, University of British Columbia, Vancouver, BC, Canada
2. British Columbia Centre on Substance Use, Vancouver, BC, Canada
3. Department of Addictology, First Faculty of Medicine, Charles University, Czech Republic
4. Department of Medicine, University of British Columbia, St. Paul’s Hospital, Vancouver, BC, Canada
5. School of Medicine, University College Dublin, Health Sciences Centre, Belfield, Ireland
6. Department of Social Psychiatry, National Institute of Mental Health, Klecany, Czech Republic; Institute of Global Health, University of Geneva, Geneva, Switzerland