1. JCOG Data Center/Operations Office, Multi-institutional Clinical Trial Support Center, National Cancer Center
2. Gastrointestinal Medical Oncology Division, National Cancer Center Hospital
3. Esophageal Surgery Division, National Cancer Center Hospital
4. Department of Radiation Oncology, National Cancer Center Hospital, Tokyo
5. Department of Surgery, Tokyo Dental College of Ichikawa General Hospital, Chiba
6. Department of Gastroenterological Surgery, Toranomon Hospital, Tokyo
7. Division of Esophageal Surgery, Shizuoka Cancer Center, Shizuoka
8. Department of Esophageal Surgery, National Cancer Center Hospital East, Chiba
9. Clinical Trial Promotion Department, Chiba Cancer Center, Chiba
10. Department of Surgery, Keio University School of Medicine, Tokyo, Japan