1. Department of Radiation Oncology Huntsman Cancer Hospital University of Utah Salt Lake City Utah
2. Division of Otolaryngology Head and Neck Surgery Department of Surgery University of Utah Salt Lake City Utah
3. Division of Oncology Department of Internal Medicine University of Utah Salt Lake City Utah
4. Study Design and Biostatistics Center Division of Epidemiology and Public Health Department of Internal Medicine University of Utah Salt Lake City Utah
5. Department of Radiation Oncology University of Washington Seattle Washington