1. Department of Internal Medicine, Yongdong Severance Hospital Pancreatobiliary Clinic, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Diagnostic Radiology, Yongdong Severance Hospital Pancreatobiliary Clinic, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Surgery, Yongdong Severance Hospital Pancreatobiliary Clinic, Yonsei University College of Medicine, Seoul, Korea.