[1] University of Toronto,Division of Emergency Medicine, Department of Medicine
[2] Sunnybrook Health Sciences Centre,Department of Emergency Services
[3] University Health Network,Department of Emergency Medicine
[4] University of Toronto,Department of Otolaryngology
[5] McMaster University,Head & Neck Surgery
[6] Queen’s University,Division of Emergency Medicine, Department of Medicine
[7] McMaster University,Department of Emergency Medicine