1. Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, Sejong, Korea
2. Department of Radiology, Yeouido St. Mary’s Hospital, Seoul, Korea
3. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
4. Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Hospital, Daejeon, Korea
5. Department of Surgery, Ewha Womans University Mokdong Hospital, Seoul, Korea
6. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
7. Department of Surgery, Asan Medical Center, Seoul, Korea
8. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
10. Department of Otolaryngology-Head and Neck Surgery, Eunpyeong St. Mary’s Hospital, Seoul, Korea
11. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
12. Department of Otolaryngology-Head and Neck Surgery, Dankook University Hospital, Cheonan, Korea
13. Department of Otolaryngology-Head and Neck Surgery, National Cancer Center, Goyang, Korea
14. Department of Internal Medicine, National Cancer Center, Goyang, Korea
15. Department of Radiology, Seoul National University Hospital, Seoul, Korea
16. Department of Surgery, Yongin Severance Hospital, Yongin, Korea
17. Department of Internal Medicine, Seoul St. Mary’s Hospital, Seoul, Korea
18. Department of Otolaryngology-Head and Neck Surgery, Gangnam Severance Hospital, Seoul, Korea
19. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea
20. Department of Surgery, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea
21. Department of Radiology, Gangneung Asan Hospital, Gangneung, Korea