1. Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Japan
2. Department of Gastroenterology, Japanese Red Cross Nagoya Daini Hospital, Japan
3. Department of Anatomic Pathology, Kurashiki Central Hospital, Japan
4. Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Japan
5. Department of Community-based Medical Education, Nagoya City University Graduate School of Medical Sciences, Japan