1. Department of Internal Medicine (IV), Osaka Medical and Pharmaceutical University , Osaka, Japan
2. Department of Medical Statistics, Research and Development Center, Osaka Medical and Pharmaceutical University , Osaka, Japan
3. Department of Health Information Management, Kurashiki Sweet Hospital , Okayama, Japan
4. Department of Rheumatology, Osaka Red Cross Hospital , Osaka, Japan
5. First Department of Internal Medicine, Kansai Medical University , Osaka, Japan
6. Department of Advanced Medicine for Rheumatic diseases, Graduate School of Medicine, Kyoto University , Kyoto, Japan
7. Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine , Hyogo, Japan
8. Rheumatology Clinic and Department of Orthopaedic Surgery, Nara Medical University , Nara, Japan
9. Department of Rheumatology, Nishinomiya Municipal Central Hospital , Hyogo, Japan
10. Department of Clinical Immunology, Graduate School of Medicine, Osaka Metropolitan University , Osaka, Japan