1 Departments of Emergency Medicine and Community Health Sciences, Cumming School of Medicine, Rm C231 Foothills Medical Centre, University of Calgary, Calgary, AB, Canada. [email protected].
2 Department of Emergency Medicine, University Health Network, Toronto, ON, Canada.
3 Division of Emergency Medicine, Department of Medicine, University of Toronto, Toronto, ON, Canada.
4 Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.