1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Internal Medicine and Institute of Liver Research, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Division of Statistics in Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Korea.