1. Department of Otorhinolaryngology-Head and Neck Surgery, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, South Korea
2. Department of Radiology, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, South Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, South Korea