1. Department of Medical Oncology, Kindai University Faculty of Medicine, Osaka, Japan
2. Department of Surgery, Kansai Rosai Hospital, Hyogo, Japan
3. Department of Surgery, Higashiosaka City Medical Center, Osaka, Japan
4. Department of Surgery, Sakai City Medical Center, Osaka, Japan
5. Department of Surgery, Kaizuka City Hospital, Osaka, Japan
6. Department of Surgery, Minoh City Hospital, Osaka, Japan
7. Department of Surgery, Yao Municipal Hospital, Osaka, Japan
8. Department of Medical Oncology, Osaka International Cancer Institute, Osaka, Japan
9. Department of Surgery, Kindai University Faculty of Medicine, Osaka, Japan
10. Department of Medical Oncology, Kindai University Nara Hospital, Nara, Japan
11. Department of Surgery, Osaka General Medical Center, Osaka, Japan
12. Department of Frontier Science for Cancer and Chemotherapy, Osaka University Graduate School of Medicine, Osaka, Japan
13. Clinical Study Support Center, Wakayama Medical University, Wakayama, Japan
14. Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine, Osaka, Japan