1. Department of Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine , South West 16, Chuo-ku , Sapporo, Hokkaido, 060-8543, Japan
2. Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine , South-1, West-16, Chuo-ku , Sapporo, Hokkaido, 060-8543, Japan
3. Department of Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine , South West 16, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan
4. Department of Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine , South West 16, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan
5. Department of Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine , South West 16, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan