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