1. 1Addiction Medicine, Department of Psychiatry, Lausanne University Hospital and University of Lausanne, Rue du Bugnon 23, CH – 1011 Lausanne, Switzerland
2. 2Research Department, Addiction Switzerland, Lausanne, Switzerland
3. 3Centre for Addiction and Mental Health, Institute for Mental Health Policy Research, Toronto, ON, Canada
4. 4Department of Health and Social Sciences, University of the West of England, Bristol, UK