1. Institute of Health Economics, Edmonton, Canada
2. Departments of Psychiatry, Medicine and Oncology, Faculty of Medicine, University of Calgary, Calgary, Canada
3. Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Alberta, Canada
4. School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada
5. Faculty of Nursing, University of Calgary, Calgary, Alberta, Canada
6. McMaster University, Hamilton, Ontario, Canada