1. Department of Pathology; Kurume University School of Medicine; Kurume Japan
2. Kurume University Research Center for Innovative Cancer Therapy; Kurume Japan
3. Ultrasound Imaging Center, Division of Hepatobiliary and Pancreatic Disease, Department of Internal Medicine; Hyogo College of Medicine; Nishinomiya Japan
4. Department of Surgery; Hyogo College of Medicine; Nishinomiya Japan
5. Department of Diagnostic Pathology; Kurume University Hospital; Kurume Japan