1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Cancer Control and Population Health, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea.
3. Center for Liver and Pancreatobiliary Cancer, Division of Gastroenterology, National Cancer Center, Goyang, Korea.
4. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.