1. Division of GastroenterologyKurume University School of Medicine Kurume Japan
2. The Research Center for Hepatitis and ImmunologyNational Center for Global Health and Medicine Ichikawa Japan
3. Division of Biomedical Statistics, Department of Integrated Medicine, Graduate School of MedicineOsaka University Osaka Japan
4. Liver Cancer Research Division, Research Center for Innovative Cancer TherapyKurume University Kurume Japan
5. Center for Comprehensive Community Medicine, Faculty of MedicineSaga University Saga Japan