Affiliation: | 1. Department of Gastroenterology and Metabolism, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan 2. Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan 3. Department of Pathology, Hiroshima University Hospital, Hiroshima, Japan 4. Faculty of Human Culture and Science, Prefectural University of Hiroshima, Hiroshima, Japan
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