1. Centre for Health Evaluation and Outcome Sciences; Providence Health Care, St Paul's Hospital; Vancouver British Columbia Canada
2. School of Population and Public Health, Faculty of Medicine; University of British Columbia; Vancouver Canada
3. Centre de Recherche du Centre Hospitalier de l’Université de Montréal; Montréal Québec Canada
4. Providence Crosstown Clinic; Providence Health Care; Vancouver British Columbia Canada
5. Department of Psychiatry; University of British Columbia; Vancouver Canada
6. Northern Ontario School of Medicine; Sudbury Ontario Canada