Affiliation: | 1. Department of Otorhinolaryngology ‐ Head and Neck Surgery, Ilsan Hospital, Dongguk University, Goyang, Gyeonggi, Korea;2. Departments of Pathology, Ilsan Hospital, Dongguk University, Goyang, Gyeonggi, Korea;3. Department of Otorhinolaryngology ‐ Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea |