1 Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa, Japan; Division of Gastroenterology, Department of Internal Medicine, College of Medicine, University of Florida, Jacksonville, Florida, USA.
2 Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa, Japan; Department of Gastroenterology, Toyooka Hospital, Hyogo, Japan.