1. Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Japan
2. Department of Gastroenterology and Hepatology, Gamagori Municipal Hospital, Japan
3. Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Japan
4. Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences, Japan
5. Department of Anatomic Pathology, Kurashiki Central Hospital, Japan