1. Department of Gastroenterology/Liver Center; Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital; Hiroshima Japan
2. Department of Gastroenterology and Metabolism, Applied Life Science, Institute of Biomedical and Health Science; Hiroshima University; Hiroshima Japan
3. Laboratory for Digestive Diseases, SNP Research Center; The Institute of Physical and Chemical Research (RIKEN); Hiroshima Japan