1. Department of Pathology; Okayama University Graduate School of Medicine Dentistry and Pharmaceutical Science; Okayama Japan
2. Division of Pathophysiology; Okayama University Graduate School of Health Science; Okayama Japan
3. Division of Gastroenterology; Hiroshima Red Cross Hospital & Atomic-bomb Survivor Hospital; Hiroshima Japan
4. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine; Dentistry and Pharmaceutical Science; Okayama Japan