^○Takuma Kishida¹, Takuro Okada², Kiyoaki Tukahara², Isaku Okamoto², Hiroki Sato², Kunihiko Tokashiki², Yusuke Aihara², Tatsuya Ito², Gai Yamashita², Takahito Kondo¹, Kouki Miura³, Yuichiro Tada³, Tatsuo Masubuchi³, Chihiro Fushimi³, Yukiomi Kushihashi³, Kenji Hanyu³, Taku Yamashita⁴, Takashi Matsuki⁴, Kaho Momiyama⁴, Yuuki Harada⁴ (1.Department of Otorhinolaryngology, Head and Neck Surgery, Tokyo Medical University Hachioji Medical Center, 2.Department of Otorhinolaryngology, Head and Neck Surgery, Tokyo Medical University, 3.Head and Neck Oncology Center, University of Health and Welfare Mita Hospital, 4.Department of Otorhinolaryngology, Head and Neck Surgery, Kitasato University Hospital)

^○Norihiko Takemoto¹, Yukinori Takenaka¹, Yoshifumi Yamamoto², Takashi Fujii³, Hidenori Inohara¹ (1.Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, 2.Department of Otorhinolaryngology-Head and Neck Surgery, Osaka General Medical Center, 3.Department of Head and Neck Surgery, Osaka International Cancer Institute)

^○Yuta Hoshi¹, Takeshi Beppu¹, Satoshi Shirakura¹, Nobuaki Koide¹, Satoru Tamii¹, Kyohei Kamata¹, Masaru Yokomura¹, Takafumi Ohno¹, Hiroki Hara² (1.Department of Head and Neck Surgery, Saitama Cancer Center, 2.Department of Gastroenterology, Saitama Cancer Center)