1. Department of Radiology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
2. Department of Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
3. Department of Pathology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
4. Department of Radiology, Kangbuk Samsung Medical Center, Seoul, Korea.