1. Department of Internal Medicine, Uijeongbu Eulji Medical Center, Eulji University College of Medicine, Uijeongbu, Korea
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
3. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
5. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
6. Health Insurance Review and Assessment, Wonju, Korea
7. Center for Liver and Pancreatobiliary Cancer, National Cancer Center, Goyang, Korea