1. Department of Emergency Medicine; University of Ottawa; Ottawa ON
2. Department of Epidemiology and Community Medicine; University of Ottawa; Ottawa ON
3. Ottawa Hospital Research Institute; The Ottawa Hospital; Ottawa ON
4. Department of Emergency Medicine; Queen's University; Kingston ON
5. Department of Biomedical and Molecular Sciences; Queen's University; Kingston ON
6. Department of Emergency Medicine and School of Public Health; Edmonton AB
7. Department of Emergency Medicine; University of Calgary; Calgary AB Canada