1. Department of Internal Medicine and Rheumatology, Juntendo University, Tokyo, Japan
2. Department of Epidemiology, Nara Medical University School of Medicine, Nara, Japan
3. Division of Hematology, Rheumatology, and Respiratory Medicine, Department of Internal Meidicine, Kagawa University, Kagawa, Japan
4. Division of Dermatology, Tohoku Medical and Pharmaceutical University, Miyagi, Japan
5. Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
6. Department of Neurology, Tokyo Women’s Medical University, Tokyo, Japan
7. Department of Nephrology and Rheumatology, Kyorin University School of Medicine, Tokyo, Japan
8. Department of Rheumatology, Tokyo Women’s Medical University School of Medicine, Tokyo, Japan