Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan. Electronic address: mmierzwa@med.umich.edu. Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan. Department of Biostatistics, University of Michigan, Ann Arbor, Michigan. The Permanente Medical Group, Rohnert Park, California. Department of Otolaryngology, University of Michigan, Ann Arbor, Michigan. Department of Speech and Language Pathology, Veterans Affairs Hospital, Ann Arbor, Michigan. Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan; Department of Radiology, University of Michigan, Ann Arbor, Michigan; Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan.