Affiliation: | ∗ Department of Radiation Oncology, Kangnam St. Mary''s Hospital, The Catholic University of Korea, Seoul, Korea;† Department of Head and Neck Surgery, Kangnam St. Mary''s Hospital, The Catholic University of Korea, Seoul, Korea;‡ Department of Diagnostic Radiology, Kangnam St. Mary''s Hospital, The Catholic University of Korea, Seoul, Korea;§ Department of Medical Oncology, Kangnam St. Mary''s Hospital, The Catholic University of Korea, Seoul, Korea |