1. Department of Hepatobiliary and Pancreatic Oncology National Cancer Center Hospital TokyoJapan
2. Department of Biostatics and Epidemiology Graduate School of Medicine Yokohama City University KanagawaJapan
3. Division of Gastrointestinal Oncology Shizuoka Cancer Center ShizuokaJapan
4. Hepatobiliary and Pancreatic Division Cancer Institute Hospital TokyoJapan
5. Department of Hepatobiliary and Pancreatic Oncology National Cancer Center Hospital East ChibaJapan
6. Division of Gastrointestinal Oncology Chiba Cancer Center ChibaJapan
7. Department of Gastrointestinal Medical Oncology Shikoku Cancer Center EhimeJapan
8. Department of Gastroenterological Oncology Hyogo Cancer Center HyogoJapan
9. Department of Gastroenterology Kitasato University School of Medicine KanagawaJapan
10. Department of Medical Oncology Kyorin University School of Medicine TokyoJapan
11. Department of Clinical Oncology St. Marianna University School of Medicine Kanagawa Japan