1. Department of Radiology, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University, Korea.
2. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea.
3. Department of Radiology, Chonnam National University Medical School, Korea.
4. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
5. Department of Radiology, Ulsan University Hospital, University of Ulsan College of Medicine, Korea.
6. Department of Diagnostic Pathology, Asan Medical Center, University of Ulsan College of Medicine, Korea.