1. Department of Diagnostic Radiology; National Cancer Center Hospital; Tokyo Japan
2. Hepato-Biliary-Pancreatic Surgery; Hamamatsu Rosai Hospital; Japan Labor Health and Welfare Organization; Hamamatsu Japan
3. Department of Pathology; Keio University School of Medicine; Tokyo Japan
4. Department of Biostatistics; School of Public Health, University of Tokyo; Tokyo Japan
5. Department of Gastroenterology and Hepatology; Kinki University School of Medicine; Sayama Japan
6. Department of Hepatology and Gastroenterology; Juntendo Shizuoka Hospital; Izunokuni Japan
7. Department of Clinical Laboratory Medicine; Kurume University Hospital; Kurume Japan
8. Department of Radiology; Kanazawa University Graduate School of Medical Science; Kanazawa Japan
9. Department of Gastroenterology and Hepatology; Musashino Red Cross Hospital; Musashino Japan
10. Department of Surgery; Kobe University Graduate School of Medicine; Kobe Japan
11. Hepato-Biliary-Pancreatic Surgery Division; Artificial Organ and Transplantation Division; Department of Surgery; Graduate School of Medicine, University of Tokyo; Tokyo Japan
12. Surgery; Japanese Red Cross Medical Center; Tokyo Japan