1. Department of Gastroenterological Surgery, Graduate School of Medicine Osaka University Osaka Japan
2. Department of Surgery, Osaka International Cancer Institute Osaka Prefectural Hospital Organization Osaka Japan
3. Department of Medical Oncology, Osaka International Cancer Institute Osaka Prefectural Hospital Organization Osaka Japan
4. Department of Gastroenterological Surgery Kansai Rosai Hospital Amagasaki Japan
5. Department of Gastroenterological Surgery Osaka General Medical Center Osaka Japan
6. Department of Surgery Osaka Rosai Hospital Osaka Japan
7. Department of Surgery Yao Municipal Hospital Osaka Japan
8. Department of Surgery Japan Community Health care Organization (JCHO) Osaka Hospital Osaka Japan
9. Department of Surgery, Surgical Oncology and Science Sapporo Medical University Sapporo Japan
10. Department of Therapeutics for Inflammatory Bowel Diseases, Graduate School of Medicine Osaka University Osaka Japan