1. Department of Otorhinolaryngology–Head and Neck Surgery, The Catholic University. of Korea, College of Medicine, St. Vincent's Hospital, Gyeonggi-do, Republic of Korea
2. Department of Otorhinolaryngology–Head and Neck Surgery, The Catholic University. of Korea, College of Medicine, Yeouido St. Mary's Hospital, Seoul, Republic of Korea
3. Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Korea University, Guro Hospital, Seoul, Republic of Korea
4. Department of Otorhinolaryngology–Head and Neck Surgery, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Republic of Korea
5. Department of Otorhinolaryngology–Head and Neck Surgery, Konkuk University School of Medicine, Konkuk University Medical Center, Seoul, Republic of Korea
6. Department of Otorhinolaryngology–Head and Neck Surgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
7. Department of Otorhinolaryngology–Head and Neck Surgery, Soonchunhyang University College of Medicine Cheonan Hospital, Chungcheongnam-do, Republic of Korea
8. Department of Otolaryngology, Ajou University School of Medicine, Ajou University Hospital, Gyeonggi-do, Republic of Korea
9. Department of Otorhinolaryngology–Head and Neck Surgery, Yeungnam University Medical Center, Daegu, Republic of Korea
10. Department of Otorhinolaryngology–Head and Neck Surgery, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea
11. Department of Otorhinolaryngology–Head and Neck Surgery, Gil Medical Center, Gachon University, Incheon, Republic of Korea
12. Department of Otorhinolaryngology–Head and Neck Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
13. Department of Otorhinolaryngology–Head and Neck Surgery, Chungnam National University Hospital, Daejeon, Republic of Korea
14. Department of Otorhinolaryngology–Head and Neck Surgery, ANSAN Hospital, Korea University, Ansan, Republic of Korea
15. Department of Otorhinolaryngology–Head and Neck Surgery, Guri Hospital, Hanyang University, Guri, Republic of Korea
16. Department of Otorhinolaryngology–Head and Neck Surgery, Konyang University Hospital, Seoul, Republic of Korea
17. Department of Otorhinolaryngology–Head and Neck Surgery, Eunpyung St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea