[1] Univ Toronto, Dept Otolaryngol Head & Neck Surg, Toronto, ON, Canada
[2] Univ Toronto, Dalla Lana Sch Publ Hlth, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[3] ICES, Toronto, ON, Canada
[4] Sunnybrook Res Inst, Sunnybrook Hlth Sci Ctr, Evaluat Clin Sci, Toronto, ON, Canada
[5] Odette Canc Ctr, Sunnybrook Hlth Sci Ctr, Dept Surg Oncol, Toronto, ON, Canada
[6] Univ Toronto, Sunnybrook Hlth Sci Ctr, Dept Radiat Oncol, Toronto, ON, Canada
[7] Univ Toronto, Sunnybrook Hlth Sci Ctr, Dept Med Oncol, Toronto, ON, Canada
[8] Univ Toronto, Michael Garron Hosp, Dept Otolaryngol Head & Neck Surg, Toronto, ON, Canada