1. The Multi-Center Clinical Study Group of Osaka, Colorectal Cancer Treatment Group (MCSGO)
2. Department of Digestive Surgery, Ikeda City Hospital
3. Department of Surgery, Minoh City Hospital
4. Department of Gastroenterological Surgery, Higashiosaka City Medical Center
5. Department of Surgery, Osaka Rosai Hospital
6. Department of Surgery, Osaka General Medical Center
7. Department of Surgery, Suita Municipal Hospital
8. Department of Surgery, Kaizuka City Hospital
9. Department of Surgery, Tane General Hospital
10. Department of Surgery, Otemae Hospital
11. Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine
12. Department of Surgery, Nishinomiya Municipal Central Hospital