1. Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine , Oita , Japan
2. Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital , Shizuoka , Japan
3. Department of Colorectal Surgery, National Cancer Center Hospital East , Chiba , Japan
4. Department of Surgery , Gastroenterological Center, , Kanagawa , Japan
5. Yokohama City University Medical Center , Gastroenterological Center, , Kanagawa , Japan
6. Department of Surgery, Kansai Rosai Hospital , Hyogo , Japan
7. Department of Gastroenterological Surgery, Saitama Medical University International Medical Center , Saitama , Japan
8. Department of Surgery, Hiroshima City Asa Citizens Hospital , Hiroshima , Japan
9. Department of Colorectal Surgery, National Cancer Center Hospital , Tokyo , Japan