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Correlation of clinical characteristics with (A–C) levels of IL‐1β in synovial fluid (SF), with (D, E) levels of IL‐18 in SF, with (F–H) lactate dehydrogenase (LDH) in SF, or with (I) levels of IL‐18 in serum of patients with rheumatoid arthritis. CRP, C‐reactive protein; ESR, erythrocyte sedimentation rate; IL, interleukin；DAS28‐ESR，Disease Activity Score in 28 Joints‐ESR.
