1. Department of Community-based Medical Education; Nagoya City University Graduate School of Medical Sciences; 1 Kawasumi, Mizuho-cho, Mizuho-ku Nagoya 467-8601 Japan
2. The Third Department of Internal Medicine; Kansai Medical University; Hirakata Japan
3. Digestive and Lifestyle Diseases; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan
4. Department of Internal Medicine; Second Teaching Hospital, Fujita Health University; Nagoya Japan
5. Center for Health, Safety and Environmental Management; Shinshu University; Matsumoto Japan
6. Internal Medicine; Tokyo Metropolitan Komagome Hospital; Tokyo Japan
7. Department of General Medicine; Hiroshima University Graduate School of Medical Science, Programs of Applied Medicine, Clinical Pharmacotherapy; Hiroshima Japan
8. Department of Gastroenterology; Graduate School of Medicine, The University of Tokyo; Tokyo Japan
9. Division of Gastroenterology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
10. Department of Gastroenterology; Tokyo Women's Medical University Yachiyo Medical Center; Tokyo Japan
11. Department of Gastroenterology; Nagoya University Graduate School of Medicine; Nagoya Japan
12. Department of Gastroenterology; Aichi Cancer Center Hospital; Nagoya Japan
13. Division of Medical Informatics, Department of Internal Medicine, Gastroenterology; Shinshu University Hospital; Matsumoto Japan
14. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan
15. Department of Pathology; Kurashiki Central Hospital; Kurashiki Japan
16. Department of Gastroenterology; Nagano Municipal Hospital; Nagano Japan
17. Department of Gastroenterology and Metabolism; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
18. Department of Human Pathology; Kanazawa University Graduate School of Medicine; Kanazawa Japan
19. Department of Medicine; Teikyo University School of Medicine; Tokyo Japan