1. Department of Gastroenterology; Fukushima Medical University School of Medicine; Fukushima Japan
2. Department of Medicine; Kurume University School of Medicine; Fukuoka Japan
3. Sanno Medical Center; International University of Health and Welfare; Tokyo Japan
4. Department of Gastroenterology and Metabology; Ehime University Graduate School of Medicine; Ehime Japan
5. Department of Gastroenterology; National Hospital Organization, Shinshu Ueda Medical Center; Ueda City Japan
6. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences; Okayama City Japan
7. Department of Hepatology; Toranomon Hospital; Tokyo Japan
8. Center for Gastroenterology; Teine Keijinkai Hospital; Sapporo Japan
9. Department of Internal Medicine; Keio University School of Medicine; Tokyo Japan
10. Department of Pediatric Hepatology and Gastroenterology; Saiseikai Yokohama Tobu Hospital; Yokohama City Japan
11. Department of Medicine; Teikyo University School of Medicine; Tokyo Japan