1. Department of Emergency Medicine; University of Ottawa; Ottawa Ontario
2. Division of Critical Care; Department of Medicine; University of Ottawa; Ottawa Ontario
3. School of Epidemiology and Public Health; University of Ottawa; Ottawa Ontario
4. Department of Surgery; University of Ottawa; Ottawa Ontario
5. Clinical Epidemiology Program; Ottawa Hospital Research Institute; Ottawa Ontario
6. Department of Medicine; Division of Critical Care, and Department of Health Research Methods, Evidence, and Impact; McMaster University; Hamilton Ontario Canada