1. Department of Therapeutic Oncology, Kyoto University Graduate School of Medicine, Kyoto
2. Gastrointestinal Medical Oncology Division, National Cancer Center Hospital, Tokyo
3. International Goodwill Hospital, Yokohama
4. Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa
5. Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya
6. Esophageal Surgery Division, National Cancer Center Hospital, Tokyo
7. Department of Gastrointestinal Surgery, Aichi Cancer Center Hospital, Nagoya
8. Department of Surgery, Keio University School of Medicine, Tokyo
9. Esophageal Surgery Division, National Cancer Center Hospital East, Kashiwa
10. Cancer Chemotherapy Center, Osaka Medical College Hospital, Takatsuki
11. Japan Clinical Oncology Group Operations Office, National Cancer Center, Tokyo
12. Japan Clinical Oncology Group Data Center, National Cancer Center, Tokyo, Japan