Affiliation: | 1. Departments of Radiology, Korea University, Guro Hospital, College of Medicine, Seoul, Korea;2. Department of Radiology, Korea University, Ansan Hospital, College of Medicine, Seoul, Korea;3. Departments of Otolaryngology and Head and Neck Surgery, Korea University, Guro Hospital, College of Medicine, Seoul, Korea;4. Department of Radiology, Seoul National University Hospital, Healthcare System Gangnam Center, Seoul, Korea |