1. Saitama Medical Center, Dokkyo Medical University, Saitama, Japan
2. School of Medicine, Showa University Tokyo, Japan
3. National Cancer Center Hospital, JCOG Data Center/Operation Office Tokyo, Japan
4. National Cancer Center Hospital Tokyo, Japan
5. Faculty of Medicine, Kindai University Osaka, Japan
6. Osaka International Cancer Institute Osaka, Japan
7. Saitama Cancer Center Saitama, Japan
8. Graduate School of Biomedical Science, Hiroshima University Hiroshima, Japan
9. Niigata Cancer Center Hospital Niigata, Japan
10. National Cancer Center Hospital East Chiba, Japan
11. Graduate School of Medicine, Kyoto University Kyoto, Japan
12. Japanese Red Cross Wakayama Medical Center, Wakayama, Japan