1. Department of Neuroradiology and Head and Neck Imaging, Princess Margaret Cancer Centre/University of Toronto Toronto Ontario Canada
2. Department of Diagnostic and Therapeutic Radiology and Research, Faculty of Medicine Ramathibodi Hospital/Mahidol University Bangkok Thailand
3. Department of Biostatistics The Princess Margaret Cancer Centre/University of Toronto 610 University Avenue Toronto Ontario M5G 2M9 Canada
4. Department of Radiation Oncology The Princess Margaret Cancer Centre/University of Toronto Toronto Ontario Canada
5. Department of Otolaryngology‐Head & Neck Surgery The Princess Margaret Cancer Centre/University of Toronto Toronto Ontario Canada
6. Department of Radiation Oncology CancerCare Manitoba/University of Manitoba Winnipeg Manitoba Canada
7. Division of Medical Oncology The Princess Margaret Cancer Centre/University of Toronto Toronto Ontario Canada