1. Department of Surgery, The Catholic University of Korea, Seoul St. Mary's Hospital, Seoul, Korea.
2. Department of Radiology, The Catholic University of Korea, Seoul St. Mary's Hospital, Seoul, Korea.
3. Department of Surgery, Inha University Hospital, Inha University, Incheon, Korea.
4. Department of Radiology, Inha University Hospital, Inha University, Incheon, Korea.