1. Division of HBP Surgery, Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
2. Pancreatobiliary Cancer Center, Yonsei Cancer Center, Severance Hospital, Seoul, Korea
3. Division of Gastroenterology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea