1. Department of Gastroenterology and Oncology, Tokushima University Graduate School of Biomedical Sciences, Japan
2. Department of Gastroenterology, National Hospital Organization Higashi Tokushima Hospital, Japan
3. Division of Pathology, Tokushima University Hospital, Japan
4. Department of Hematology, Endocrinology and Metabolism, Tokushima University Graduate School of Biomedical Sciences, Japan