1. Department of Otolaryngology–Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois
2. Department of Otolaryngology–Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, Indiana
3. Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana
4. Department of Radiation Oncology, Winship Cancer Institute of Emory University, Atlanta, Georgia
5. Department of Radiation Oncology, Moffitt Cancer Center, Tampa, Florida