1. Center for Liver and Pancreatobiliary Cancer, National Cancer Center, Goyang, Korea
2. Division of Cancer Registration and Surveillance, National Cancer Center, Goyang, Korea
3. Department of Cancer Control & Population Health, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea
4. Department of Surgery, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea
5. Division of Health Administration, Yonsei University, Wonju, Korea