1. Department of Hepatobiliary and Pancreatic Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Urology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.