Institution: | 2. Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX;3. Department of Otolaryngology, University of Texas Southwestern Medical Center, Dallas, TX;4. Valley Radiation Therapy Center, Anchorage, AK;5. Department of Radiation Oncology, Abramson Comprehensive Cancer Center, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA;6. Department of Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, TX |