1. Division of Gastroenterology and Hepatology Nippon Medical School Tokyo Japan
2. Core Research Facilities for Basic Science, Research Center for Medical Sciences The Jikei University School of Medicine Tokyo Japan
3. Division of Gastroenterology, Department of Internal Medicine Kikkoman General Hospital Miyazaki Noda Japan
4. Department of Gastroenterology, Internal Medicine Kitasato University School of Medicine Sagamihara Japan
5. Division of Gastroenterology Nippon Medical School Chiba Hokusoh Hospital Chiba Japan
6. Division of Endocrinology, Diabetes and Metabolism Nippon Medical School Tokyo Japan