1. Department of Radiology, Uijongbu St. Mary's Hospital, Catholic University College of Medicine, Kyunggido 480-717, Korea.
2. Department of Radiology, Kangnam St. Mary's Hospital, Catholic University College of Medicine, Seoul 137-701, Korea.
3. Department of Surgery, Uijongbu St. Mary's Hospital, Catholic University College of Medicine, Kyunggido 480-717, Korea.
4. Department of Clinical Pathology, Uijongbu St. Mary's Hospital, Catholic University College of Medicine, Kyunggido 480-717, Korea.