1. Department of Emergency and General Medicine, Kyorin University , Tokyo, 181-8611 , Japan
2. Immuno-Rheumatology Center, St. Luke’s International Hospital , Tokyo, 104-8560 , Japan
3. Division of Rheumatology, Brigham and Women’s Hospital , Boston, MA, 02115 , United States
4. Department of General Medicine, Chiba University Hospital , Chiba, 260-0856 , Japan
5. Department of Community-Oriented Medical Education, Chiba University School of Medicine , Chiba, 260-0856 , Japan
6. Division of Medical Education, Juntendo University School of Medicine , Tokyo, 113-8421 , Japan
7. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University Hospital , Tochigi, 321-0293 , Japan
8. Division of General Medicine , Center for Community Medicine, , Tochigi, 329-0498 , Japan
9. Jichi Medical University , Center for Community Medicine, , Tochigi, 329-0498 , Japan
10. Department of Internal Medicine , Mito Kyodo General Hospital, , Ibaraki, 310-0015 , Japan
11. University of Tsukuba , Mito Kyodo General Hospital, , Ibaraki, 310-0015 , Japan
12. Muribushi Okinawa Center for Teaching Hospitals , Okinawa, 901-2132 , Japan
13. Tokyo Foundation for Policy Research , Tokyo, 106-0032 , Japan