1. 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. Department of Surgery, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea
4. Division of Colorectal Surgery, Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea