1. Medical Course, Yonsei University College of Medicine, Seoul, Korea.
2. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
3. Pancreaticobiliary Cancer Clinic, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.
4. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Endocrinology, Yonsei University College of Medicine, Seoul, Korea.