1. Department of Surgery, Yokoyama Memorial Hospital
2. Saigusa Coloproctological Clinic
3. Department of Surgery, Research Hospital, Institute of Medical Science, University of Tokyo
4. Yokoyama IBD Clinic
5. Department of Surgery, Shinshiro Municipal Hospital
6. Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine
7. Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine