1. Hepatobiliary and Pancreatic Medical Oncology; National Cancer Center Hospital; Tokyo; Japan
2. Japan Clinical Oncology Group Data Center; Multi-institutional Clinical Trial Support Center; National Cancer Center; Tokyo; Japan
3. Department of Hepatobiliary and Pancreatic Medical Oncology; Kanagawa Cancer Center; Kanagawa; Japan
4. Hepatobiliary and Pancreatic Medical Oncology; National Cancer Center Hospital East; Chiba; Japan
5. Department of Oncology; Tochigi Cancer Center; Tochigi; Japan
6. Hepatobiliary and Pancreatic Division; Cancer Institute Hospital; Tokyo; Japan
7. Department of Clinical Oncology; St. Marianna University School of Medicine; Kanagawa; Japan
8. Department of Medical Oncology; Kyorin University School of Medicine; Tokyo; Japan