1. Department of Primary Health Care, International Program in Evidence Based Health Care, University of Oxford, Oxford, UK
2. Department of Family Medicine, McGill University, Quebec, Canada
3. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
4. Gold Coast Health, Griffith University, Gold Coast, Australia
5. Department of Emergency Medicine, University of Ottawa, Ottawa, ON, Canada
6. Clinical Epidemiology Program, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada