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Correlation between TST size and (a) prednisone u-y in RA patients with prednisone therapy, (b) MTX u-y in RA patients with prednisone therapy, and (c) MTX u-y in RA patients without prednisone therapy. TST = tuberculin skin test; u-y = unit years; RA = rheumatoid arthritis; MTX = methotrexate.
