1. Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea
2. Department of Internal Medicine, Inje University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
6. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea