1. Department of Radiology, Soonchunhyang University Seoul Hospital, Seoul, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Otolaryngology-Head and Neck Surgery, Kosin University College of Medicine, Busan, Korea.
4. Department of Radiology, Korean Association of Health Promotion, Busan, Korea.
5. Department of Radiology, Haeundae Sharing and Happiness Hospital, Busan, Korea.