Affiliation: | (1) Department of Otolaryngology, Hirosaki University School of Medicine, Hirosaki, Japan;(2) Department of Head and Neck Oncology and Surgery, International University of Health and Welfare Mita Hospital, Tokyo, Japan;(3) Department of Pathology, Hirosaki University School of Medicine, Hirosaki, Japan;(4) Department of Pathology, Odate Municipal Hospital, Odate, Japan |