1. Complex Pain and Addiction Services, Vancouver General Hospital, Vancouver, BC, Canada
2. Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
3. Department of the Provincial Health Services Authority, BC Mental Health & Substance Use Services, Provincial Health Services Authority, BC, Canada
4. Department of Psychiatry and Behavioral Neurosciences, School of Medicine, and Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, USA