1. Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Radiology, Chungbuk National University Hospital, Cheongju, Korea.
3. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
4. Division of Biomedical Engineering, Hankuk University of Foreign Studies, Yongin, Korea.
5. Department of Radiology, Gyeongsang National University Hospital and College of Medicine, Gyeongsang National University, Jinju, Korea.