1. Department of Otorhinolaryngology-Head and Neck Surgery, Inha University College of Medicine, Incheon, Korea.
2. Department of Radiology, Yonsei University Health System, Seoul, Korea.
3. Department of Neurosurgery, Yonsei University Health System, Seoul, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Yonsei University Health System, Seoul, Korea.
5. Department of Otorhinolaryngology-Head and Neck Surgery, Konkuk University College of Medicine, Seoul, Korea.
6. Department of Otorhinolaryngology, Soonchunhyang University College of Medicine, Bucheon, Korea.
7. Department of Otorhinolaryngology, Yonsei Head and Neck Cancer Clinic, Seoul, Korea.