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