1. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
2. Department of Internal Medicine, Dankook University Hospital, Dankook University College of Medicine, Cheonan, Korea
3. Departments of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
4. Departments of Rehabilitation Medicine, Ewha Womans University College of Medicine, Seoul, Korea
5. Department of Statistics, Kyungpook National University, Daegu, Korea
6. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
7. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea
9. Department of Internal Medicine, Eulji Hospital, Eulji University School of Medicine, Seoul, Korea
10. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea