1. Yonsei University College of Medicine, Seoul, Korea.
2. Department of Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Division of Thyroid and Endocrine Surgery, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.
4. Department of Surgery, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.
5. Department of Urology, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.
6. Division of Hepatobiliary and Pancreatic Surgery, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.
7. Department of Pancreaticobiliary Cancer Clinic, Yonsei Cancer Center, Severance Hospital, Seoul, Korea.