1. Department of Otorhinolaryngology-Head and Neck Surgery, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
2. Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, Korea.
3. Department of Otorhinolaryngology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
4. Department of Otorhinolaryngology-Head & Neck Surgery, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
5. Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Korea.
6. Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Ewha Womans University, Seoul, Korea.
7. Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
9. Department of Otorhinolaryngology-Head and Neck Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
10. Department of Otorhinolaryngology-Head and Neck Surgery, Korea University Guro Hospital, Seoul, Korea.
11. Department of Otorhinolaryngology, Kangwon National University College of Medicine, Chuncheon, Korea.
12. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
13. Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea.
14. Department of Otorhinolaryngology-Head and Neck Surgery, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.