1. Department of General Medicine Chiba University Hospital Chiba Japan
2. Emergency and Critical Care Center Kurashiki Central Hospital Kurashiki Japan
3. Department of Community, Family, and General Medicine Kumamoto University Hospital Kumamoto Japan
4. Department of Infectious Diseases St. Luke's International Hospital Tokyo Japan
5. Department of Internal Medicine Mito Kyodo General Hospital Mito Japan
6. Department of General Medicine Okayama University Hospital Okayama Japan
7. Minamisoma Municipal General Hospital Minamisoma Japan
8. Department of Medical Education Studies, International Research Center for Medical Education, Graduate School of Medicine The University of Tokyo Bunkyo Japan
9. Department of Psychosomatic Internal Medicine Health Sciences University of Hokkaido Hospital Sapporo Japan
10. Department of Internal Medicine Imai Hospital Inagawa Japan
11. Department of General Medicine, Faculty of Medicine Shimane University Izumo Japan