1. Department of Epidemiology Infectious Disease Control and Prevention Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
2. Department of Internal Medicine Japanese Red Cross Society Himeji Hospital Himeji Japan
3. Department of Gastroenterology and Hepatology Ogaki Municipal Hospital Ogaki Japan
4. Faculty of Nursing Gifu Kyoritsu University Ogaki Japan
5. Project Research Center for Epidemiology and Prevention of Viral Hepatitis and Hepatocellular Carcinoma Hiroshima University Hiroshima Japan
6. Department of Gastroenterology and Metabolism Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
7. Research Center for Hepatology and Gastroenterology Hiroshima University Hiroshima Japan