1. Department of Radiology, Cheonan Hospital, Soonchunhyang University, Choongnam 330-720, Korea.
2. Department of Surgery, Cheonan Hospital, Soonchunhyang University, Choongnam 330-720, Korea.
3. Department of Pathology, Cheonan Hospital, Soonchunhyang University, Choongnam 330-720, Korea.