1. Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine, Seoul 152-703, Korea.
2. Department of Pathology, Korea University Guro Hospital, Korea University College of Medicine, Seoul 152-703, Korea.
3. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
4. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.