1. Department of Radiology and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
2. Department of radiology, Soonchunhyang University College of Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.
3. Department of Radiology, Chungbuk National University Hospital, Cheongju, Korea.
4. Department of Radiology, Pusan National University Yangsan Hospital, Yangsan, Korea.
5. Department of Radiology, Kosin University Gospel Hospital, Busan, Korea.
6. Department of Radiology, Chonnam National University Hospital, Gwangju, Korea.
7. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.