1. Division of Gastroenterology, Department of Internal Medicine; Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital; Hiroshima Japan
2. Department of Health and Science; Prefectural University of Hiroshima; Hiroshima Japan
3. Department of Gastroenterology and Metabolism; Hiroshima University; Hiroshima Japan
4. Department of Hematology; Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital; Hiroshima Japan
5. Department of Hematology and Oncology, Research Institute for Radiation Biology and Medicine; Hiroshima University; Hiroshima Japan
6. Department of Pathology; Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences; Okayama Japan
7. Department of Pathology; Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital; Hiroshima Japan
8. Shin Nippon Biomedical Laboratories, Ltd.; Kagoshima Japan
9. Department of Gastroenterology; Chiba Hokusou Hospital, Nippon Medical School; Chiba Japan
10. Department of Endoscopy and Medicine, Graduate School of Biomedical and Health Science; Hiroshima University; Hiroshima Japan