1. Department of Family & Community Medicine and Primary Care Research Unit, Sunnybrook Health Sciences Centre; Department of Family & Community Medicine, University of Toronto, Toronto, Canada
2. Department of Medicine and Rotman Research Institute, Baycrest Health Sciences; Department of Medicine, University of Toronto, Toronto, Canada
3. Department of Emergency Services, Sunnybrook Health Sciences Centre; Department of Medicine, University of Toronto, Toronto, Canada
4. Department of Family & Community Medicine, University of Toronto, Toronto, Canada
5. Department of Physical Therapy, University of Toronto; Research Department, Toronto Rehabilitation Institute, University Health Network, Toronto, Canada