1. Department of Gastroenterology and Gastrointestinal Oncology National Cancer Center Hospital East KashiwaJapan
2. Department of Medical Oncology Kinki University Faculty of Medicine OsakaJapan
3. Department of Medical Oncology Izumi Municipal Hospital OsakaJapan
4. Division of Gastroenterology Chiba Cancer Center ChibaJapan
5. Division of Gastrointestinal Oncology Shizuoka Cancer Center ShizuokaJapan
6. Division of Gastroenterology University of Tsukuba TsukubaJapan
7. Department of Gastroenterological Oncology Hyogo Cancer Center AkashiJapan
8. Department of Medical Oncology Toranomon Hospital TokyoJapan
9. Department of Medical Oncology Keiyukai Sapporo Hospital SapporoJapan
10. Department of Gastrointestinal Medical Oncology National Hospital Organization Shikoku Cancer Center MatsuyamaJapan
11. Department of Genome Biology Kindai University Faculty of Medicine OsakaJapan
12. Medical Information Center Kyushu University Hospital FukuokaJapan
13. Department of Biostatistics Yokohama City University YokohamaJapan
14. Division of Gastrointestinal Medical Oncology National Cancer Center Hospital TokyoJapan
15. Department of Clinical Oncology Aichi Cancer Center Hospital Nagoya Japan