1. Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center; University of Ulsan College of Medicine; Seoul Republic of Korea
2. the Department of Otorhinolaryngology-Head and Neck Surgery; Kangwon National University School of Medicine; Chuncheon Republic of Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, Ulsan University Hospital; University of Ulsan College of Medicine; Ulsan Republic of Korea