1. Department of Rheumatology, Sasebo Chuo Hospital, Japan
2. Department of Immunology and Rheumatology, Division of Advanced Preventive Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, Japan
3. Department of Orthopedic Surgery, Sasebo Chuo Hospital, Japan
4. Department of Pathology, Sasebo Chuo Hospital, Japan.
5. Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Japan