[1] Mt Sinai Med Ctr, Dept Otolaryngol Head & Neck Surg, New York, NY 10029 USA
[2] Princess Margaret Canc Ctr, Dept Biostat, Toronto, ON, Canada
[3] Princess Margaret Canc Ctr, Dept Otolaryngol Head & Neck Surg, Toronto, ON, Canada
[4] Princess Margaret Canc Ctr, Dept Med Oncol & Hematol, Toronto, ON, Canada
[5] McMaster Univ, Dept Hlth Policy & Management, Hamilton, ON, Canada
[6] Princess Margaret Canc Ctr, Dept Radiat Oncol, Toronto, ON, Canada
[7] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[8] Univ Toronto, Dept Speech Language Pathol, Toronto, ON, Canada