1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Biostatistics, Graduate School of Public Health, Yonsei University, Seoul, Korea.
5. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.
7. Department of Medicine, Samsung Medical Center, Seoul, Korea.
8. Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
9. Division of Gastroenterology, Department of Internal Medicine and Inflammatory Bowel Disease Center, Kangbuk Samsung Hospital, School of Medicine, Sungkyunkwan University, Seoul, Korea.
10. Medical Research Institute, Kangbuk Samsung Hospital, School of Medicine, Sungkyunkwan University, Seoul, Korea.
11. Department of Gastroenterology and Inflammatory Bowel Disease Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
13. Graduate School, Dankook University, Yongin, Korea.