1Department of Otolaryngology-Head and Neck Surgery, The Catholic University of Korea College of Medicine, Incheon, Korea.
2Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. whchung@skku.edu
3Department of Otolaryngology Head and Neck Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
4Department of Otolaryngology, Kangwon National University Hospital, Chuncheon, Korea.
5Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6Deparment of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University Hospital, Soonchunhyang University School of Medicine, Bucheon, Korea.
7Department of Otolaryngology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
8Department of Otolaryngology-Head & Neck Surgery, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
9Department of Otolaryngology, Pusan national University School of Medicine, Pusan, Korea.
10Department of Otorhinolaryngology, Seoul National University Bundang Hospital, Seongnam, Korea.
11Department of Otolaryngology-Head and Neck Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
12Department of Otorhinolaryngology-Head and Neck Surgery, Jeju National University College of Medicine, Jeju, Korea.
13Department of Otolaryngology, Bundang Jesaeng Hospital, Daejin Medical Center, Seongnam, Korea.
14Department of Otolaryngology-Head and Neck Surgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
15Department of Otorhinolaryngology, Keimyung University Dongsan Medical Center, School of Medicine, Keimyung Univiersity, Daegu, Korea.
16Department of Otolaryngology-Head and Neck Surgery, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
17Department of Otolaryngology-Head and Neck Surgery, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
18Department of Otolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
19Department of Otorhinolaryngology-Head and Neck Surgery, Yeungnam University College of Medicine, Daegu, Korea.
20Department of Otolaryngology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
21Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
22Department of Otolaryngology-Head and Neck Surgery, Bucheon St. Mary's Hospital, The Catholic University of Korea, Bucheon, Korea.
23Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
24Department of Otorhinolaryngology, Dongguk University Ilsan Medical Center, Goyang, Korea.
25Soree Ear Clinic, Seoul, Korea.
26Department of Otorhinolaryngology, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea.
27Department of Otolaryngology, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea.
28Soree Ear Clinic, West Center, Seoul, Korea.
29Department of Otolaryngology-Head and Neck Surgery, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, Uijeongbu, Korea.
30Department of Otolaryngology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.
31Department of Otolaryngology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
32Department of Otolaryngology-Head and Neck Surgery, Kosin University Hospital, Kosin University College of Medicine, Busan, Korea.
33Department of Otorhinolaryngology, Hallym University College of Medicine, Chuncheon, Korea.
34Department of Otolaryngology, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.