1. Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Republic of Korea
2. Department of Otorhinolaryngology-Head and Neck Surgery, Yeouido St. Mary’s Hospital, The Catholic University of Korea, College of Medicine, Seoul, Republic of Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam-si, Republic of Korea