1. Department of Otorhinolaryngology: Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania U.S.A.
2. Department of Radiation Oncology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania U.S.A.
3. Department of Internal Medicine, Division of Hematology‐Oncology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania U.S.A.
4. University of Maryland Medical Center Baltimore Maryland U.S.A.