[1] Dalhousie University,Division of Otolaryngology, Head & Neck Surgery
[2] University of Toronto,Institute of Health Policy, Management and Evaluation
[3] University of Toronto,Department of Otolaryngology, Head & Neck Surgery
[4] University of Toronto,Division of General Surgery, Department of Surgery
[5] Sunnybrook Health Sciences Centre,Division of General Surgery, Department of Surgery
[6] Sunnybrook Health Sciences Centre,Department of Otolaryngology, Head & Neck Surgery
[7] Sunnybrook Health Sciences Centre,Department of Critical Care Medicine