1. Department of Radiology, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon 301-721, Korea.
2. Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon 301-721, Korea.
3. Department of Surgery, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon 301-721, Korea.
4. Department of Radiology, Konyang University Hospital, Konyang University College of Medicine, Daejeon 371-718, Korea.