1 Division of Critical Care, Department of Medicine, University of Ottawa, Ottawa, ON, Canada; Department of Emergency Medicine, University of Ottawa, Ottawa, ON, Canada.
2 Division of Critical Care, Department of Medicine, University of Ottawa, Ottawa, ON, Canada; Division of Thoracic Surgery, Department of Surgery, University of Ottawa, Ottawa, ON, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada. Electronic address: aseely@toh.ca.