1. Department of Internal medicine Japanese Red Cross Society Himeji Hospital Himeji Japan
2. Department of Internal Medicine, Division of Gastroenterology and Hepatology Hyogo Medical University Nishinomiya Japan
3. Faculty of Nursing Gifu Kyoritsu University Ogaki Japan
4. Department of Internal medicine Himeji St. Mary's Hospital Himeji Japan
5. Department of Epidemiology, Infectious Disease Control and Prevention, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan