1. Department of Colorectal Surgery Toranomon Hospital Tokyo Japan
2. Department of Surgery Kyoto University Hospital Kyoto Japan
3. Department of General and Gastrointestinal Surgery Kitasato University Kitasato Institute Hospital Tokyo Japan
4. Department of Gastroenterological Surgery Tokai University School of Medicine Isehara Japan
5. Department of Gastroenterological Surgery Fukuoka University Hospital Fukuoka Japan
6. Department of Colorectal Surgery Tohoku Rosai Hospital Sendai Japan
7. Department of Surgery Toho University Ohashi Medical Center Tokyo Japan
8. Department of Gastroenterological and Pediatric Surgery OITA University Faculty of Medicine Oita Japan
9. Department of Surgery and Oncology Graduate School of Medical Sciences, Kyushu University Fukuoka Japan
10. Department of Gastrointestinal Surgery Red Cross Hospital Osaka Osaka Japan