1. Department of Rheumatology, Fukushima Medical University School of Medicine, Fukushima, Japan;
2. Molecular and Genetic Epidemiology Laboratory, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan;
3. Department of Rheumatology, Ohta Nishinouchi General Hospital Foundation, Koriyama, Fukushima, Japan;
4. Department of Immunology and Rheumatology, Unit of Translational Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan;
5. Department of Rheumatology, Sasebo Chuo Hospital, Sasebo, Japan