1 Sunnybrook Centre for Prehospital Medicine, Toronto, Ontario, Canada; Department of Family and Community Medicine, Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, St. Michaels Hospital, Toronto, Ontario, Canada. Electronic address: Sheldon.Cheskes@sunnybrook.ca.
2 St. Michaels Hospital, Toronto, Ontario, Canada.
3 Sunnybrook Centre for Prehospital Medicine, Toronto, Ontario, Canada; Department of Medicine, Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada.
4 Department of Family and Community Medicine, Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada; Schwartz/Reisman Emergency Medicine Institute, Sinai Health System, Toronto, Ontario, Canada.
5 Li Ka Shing Knowledge Institute, St. Michaels Hospital, Toronto, Ontario, Canada; Department of Medicine, Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada; Department of Critical Care Medicine, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.
6 Department of Critical Care Medicine, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.
7 Sunnybrook Centre for Prehospital Medicine, Toronto, Ontario, Canada.
8 Li Ka Shing Knowledge Institute, St. Michaels Hospital, Toronto, Ontario, Canada; Department of Medicine, Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada.
9 Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Sunnybrook Research Institute, Toronto, Ontario, Canada.