[1] Hokkaido University Graduate School of Medicine,Department of Otolaryngology
[2] National Cancer Center Hospital East,Head and Neck Surgery
[3] Japanese Foundation for Cancer Research,Division of Head and Neck Surgery
[4] Osaka Medical Center for Cancer and Cardiovascular Diseases,Department of Head and Neck Oncology, Cancer Institute Hospital
[5] Hyogo Cancer Center,Department of Otolaryngology, Head and Neck Surgery
[6] Aichi Cancer Center,Department of Head and Neck Surgery
[7] Kobe University Graduate School of Medicine,Department of Head and Neck Surgery
[8] Jikei University School of Medicine,Department of Otolaryngology
[9] Tohoku University School of Medicine,Head and Neck Surgery
[10] Miyagi Cancer Center,Department of Oto
[11] National Shikoku Cancer Center,Rhino
[12] National Tokyo Medical Center,Laryngology