1. Department of Otorhinolaryngology - Head and Neck Surgery, Bundang CHA Medical Center, Seongnam, Republic of Korea;
2. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea;
3. Department of Otorhinolaryngology - Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Chuncheon, Republic of Korea;
4. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Republic of Korea;
5. Department of Neurosurgery, Seoul National University Hospital, Seoul, Republic of Korea