Affiliation: | 1. Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa;2. Department of Hematology–Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa;3. Department of Biostatistics, University of Iowa Hospitals and Clinics, Iowa City, Iowa;4. Department of Otolaryngology Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa |