1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
3. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
4. Department of Internal Medicine, Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
5. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea