1. Department of MedicineMcMaster University Hamilton Ontario Canada
2. Department of Health Research Methods, Evidence and ImpactMcMaster University Hamilton Ontario Canada
3. Schwartz/Reisman Emergency Medicine Research InstituteSinai Health System Toronto Ontario Canada
4. Division of Emergency Medicine, Department of Family and Community MedicineUniversity of Toronto Toronto Ontario Canada
5. Emergency DepartmentHamilton Health Sciences Hamilton Ontario Canada