1. Department of Radiology, Danwon General Hospital, Ansan, Korea.
2. Department of Otorhinolaryngology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
3. Department of Pathology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
4. Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.