1. Faculty of Health Science, Department of Paramedics, Kyorin University
2. Department of Colorectal Surgery, Tokyo Medical and Dental University
3. Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
4. Department of General and Gastrointestinal Surgery, Toho University Omori Medical Center
5. Department of Surgery, Toho University Ohashi Medical Center
6. Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University
7. Department of Surgery, Teikyo University
8. Department of Gastroenterological Surgery, International University of Health and Welfare Ichikawa Hospital
9. Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Nippon Medical School
10. Department of Surgery, The Jikei University School of Medicine
11. Department of Surgery, Kyorin University