1. Division of Emergency Medicine; Department of Medicine; University of Toronto; Toronto Ontario Canada
2. Department of Emergency Medicine Sick Kids Hospital; Toronto Ontario Canada
3. Division of General Internal Medicine; University Health Network; Institute for Clinical Evaluative Sciences; Institute for Health Policy, Management and Evaluation; Department of Medicine; University of Toronto; Toronto Ontario Canada
4. Canadian Stroke Network; Ottawa Ontario Canada
5. Sunnybrook Research Institute; Institute for Health Policy, Management and Evaluation; University of Toronto; Toronto Ontario Canada
6. Institute for Clinical Evaluative Sciences; Toronto Ontario Canada
7. Clinical Epidemiology Unit; Sunnybrook Health Sciences Centre; Toronto Ontario Canada