1. Shizuoka General Hospital, Shizuoka, Japan
2. Gastric Surgery Division, National Cancer Center Hospital, Tokyo, Japan
3. Japan Clinical Oncology Group Data Center Center for Research Administration and Support, National Cancer Center, Tokyo, Japan
4. Japan Clinical Oncology Group Operations Office, National Cancer Center, Tokyo, Japan
5. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, Yokohama, Japan
6. Division of Gastric Surgery, Shizuoka Cancer Center, Nagaizumi, Japan
7. Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, Nagoya, Japan
8. Dept. of Surgery, NHO Sendai Medical Center, Sendai, Japan
9. Department of Surgery, Iwate Medical University School of Medicine, Morioka, Japan
10. Department of Gastroenterological Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
11. Department of Surgery, Yamagata Prefectural Central Hospital, Yamagata, Japan
12. Dept. of Surgery, Hyogo Cancer Center, Nishinomiya, Japan
13. Dept. of Surgery, Tenri Hospital, Tenri, Japan
14. Osaka Medical Center for Cancer and Cardiovascular Disease, Osaka, Japan
15. Department of Surgery, Hyogo College of Medicine, Nishinomiya, Japan