C reactive protein; cyclic citrullinated peptide antibody; disease modifying antirheumatic drug; endogenous compound; peptide antibody; achievement; aged; body mass; cohort analysis; conference abstract; controlled study; DAS28; disease control; drug therapy; erosion; female; foot; Health Assessment Questionnaire; human; major clinical study; male; onset age; patient referral; prescription; remission; rheumatoid arthritis; risk factor; X ray film