Affiliation: | 1. Department of Otolaryngology – Head and Neck Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan;2. Department of Head and Neck Surgery, National Cancer Center, Tokyo, Japan;3. Department of Head and Neck Surgery, Saitama Medical University International Medical Center, Saitama, Japan;4. Department of Head and Neck Surgery, Tokyo Medical and Dental University, Tokyo, Japan |