1. Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University, College of Medicine, Seoul, Korea.
2. Department of Surgery, Severance Hospital, Yonsei University, College of Medicine, Seoul, Korea.
3. Department of Pathology, Yongin Severance Hospital, Yonsei University, College of Medicine, Yongin, Korea.
4. Department of Pathology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.