1. Department of Internal Medicine; Soonchunhyang University College of Medicine; Seoul Korea
2. University of Ulsan College of Medicine; Seoul Korea
3. Hallym University College of Medicine; Hwasung Korea
4. Yonsei University College of Medicine; Seoul Korea
5. Seoul National University College of Medicine and Liver Research Institute; Seoul Korea
6. Sungkyunkwan University School of Medicine; Seoul Korea
7. Korea University College of Medicine; Ansan Korea
8. Soonchunhyang University College of Medicine; Bucheon Korea
9. Biostatistical Consulting Unit; Soonchunhyang University Medical Center; Seoul Korea