1. Department of Otolaryngology-Head and Neck Surgery, University of Toronto, Toronto, Ontario, Canada
2. Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada
3. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
4. Department of Biostatistics, the Princess Margaret Hospital Cancer Centre, Toronto, Ontario, Canada
5. Department of Radiation Oncology, the Princess Margaret Cancer Centre, Toronto, Ontario, Canada