1. Department of Gastroenterology and Metabolism, Applied Life Science; Institute of Biomedical & Health Science, Hiroshima University; Hiroshima Japan
2. Research Center for Hepatology and Gastroenterology, Hiroshima University; Hiroshima Japan
3. Laboratory for Digestive Diseases, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN); Hiroshima Japan
4. Department of Gastroenterology; Onomichi General Hospital; Onomichi Japan
5. Department of Gastroenterology; Tsuchiya General Hospital; Hiroshima Japan
6. Department of Gastroenterology; Chugoku Rousai Hospital; Kure Japan
7. Department of Internal Medicine; Saiseikai Kure Hospital; Kure Japan
8. Department of Gastroenterology; Hiroshima Red Cross Hospital & Atomic-Bomb Survivors Hospital; Hiroshima Japan
9. Department of Gastroenterology; National Hospital Organization, Kure Medical Center and Chugoku Cancer Center; Kure Japan
10. Department of Gastroenterology; Hiroshima City Asa Hospital; Hiroshima Japan
11. Department of Gastroenterology; Mazda Hospital; Hiroshima Japan
12. Nakamura Clinic; Hiroshima Japan