Division of Emergency Medicine, Department of Medicine, University of Toronto, C. David Naylor Building, 6 Queen's Park Crescent West, Third Floor, Room 304, Toronto, ON, M5S 3H2, Canada. anton.nikouline@mail.utoronto.ca. Division of Emergency Medicine, Department of Medicine, University of Toronto, C. David Naylor Building, 6 Queen's Park Crescent West, Third Floor, Room 304, Toronto, ON, M5S 3H2, Canada. Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA. International Centre for Surgical Safety, St. Michael's Hospital, Toronto, ON, Canada. Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada. Department of Emergency Medicine, St. Michael's Hospital, Toronto, ON, Canada.