1. Division of Hospital Medicine University of Tsukuba Hospital Ibaraki Japan
2. The Center for Preventive Medicine St. Luke's International Hospital Tokyo Japan
3. Ohta Nishinouchi Hospital Koriyama Japan
4. Department of Cardiology Tokyo Medical University Ibaraki Medical Center Ibaraki Japan
5. Department of Gastroenterology St. Luke's International Hospital Tokyo Japan
6. Division of General Internal Medicine, Department of Medicine Tokyo Medical University Ibaraki Medical Center Ibaraki Japan
7. Fujita Health University Toyoake Japan
8. Department of general medicine Juntendo University Faculty of Medicine Tokyo Japan
9. Division of General Internal Medicine, Department of Medicine St Lukes International Hospital Tokyo Japan