| Affiliation: | 1. Department of Otolaryngology–Head and Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan;2. Division of Head and Neck Surgery, National Cancer Center Hospital East, Kashiwa, Japan;3. Division of Head and Neck Surgery, Miyagi Cancer Center, Sendai, Japan;4. Department of Otolaryngology–Head and Neck Surgery, Tohoku University School of Medicine, Sendai, Japan;5. Department of Head and Neck Oncology, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan;6. Department of Otorhinolaryngology–Head and Neck Surgery, National Shikoku Cancer Center, Matsuyama, Japan;7. Department of Head and Neck Surgery, Aichi Cancer Center, Nagoya, Japan;8. Department of Head and Neck Surgery, Shizuoka Cancer Center, Shizuoka, Japan;9. Department of Otolaryngology, Nagoya University Graduate School of Medicine, Nagoya, Japan;10. Department of Head and Neck Surgery, Hyogo Cancer Center, Akashi, Japan;11. Department of Otolaryngology, Tokai University, Isehara, Japan;12. Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan;13. Department of Otolaryngology, Head and Neck Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan;14. Department of Otorhinolaryngology, National Tokyo Medical Center, Tokyo, Japan |
