1. Department of Head and Neck Medical Oncology National Cancer Center Hospital East Kashiwa Japan
2. Department of Gastrointestinal Oncology National Cancer Center Hospital East KashiwaJapan
3. Japan Clinical Oncology Group Data Center National Cancer Center TokyoJapan
4. Exploratory Oncology Research and Clinical Trial Center National Cancer Center KashiwaJapan
5. Department of Radiology Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital TokyoJapan
6. Japan Clinical Oncology Group Operations Office National Cancer Center TokyoJapan
7. Department of Gastrointestinal Medical Oncology National Cancer Center Hospital TokyoJapan
8. Division of Gastrointestinal Oncology Shizuoka Cancer Center ShizuokaJapan
9. Department of Clinical Oncology Aichi Cancer Center Hospital NagoyaJapan
10. Keio Cancer Center Keio University Hospital Tokyo Japan