1. Department of Otolaryngology; Gangneung Asan Hospital, University of Ulsan College of Medicine; Gangneung
2. Departments of Otorhinolaryngology-Head and Neck Surgery; Asan Medical Center, University of Ulsan College of Medicine; Seoul
3. Departments of Neurosurgery; Asan Medical Center, University of Ulsan College of Medicine; Seoul
4. Departments of Otorhinolaryngology (Y.-S.C.); Sungkyunkwan University; School of Medicine; Seoul
5. Neurosurgery (D.-S.K.); Samsung Medical Center, Sungkyunkwan University, School of Medicine; Seoul
6. Departments of Otorhinolaryngology (J.-W.K.); Seoul National University Bundang Hospital; Bundang Korea
7. Neurosurgery (J.-H.H.); Seoul National University Bundang Hospital; Bundang Korea