M Mier-Madsen

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IgM- and IgA-rheumatoid factors (RF) were determined by ELISA technique in 40 consecutive patients with primary Sjögren syndrome (primary SS), all fulfilling the Copenhagen diagnostic criteria. Increased concentrations of IgM-RF were found in 25 patients (63%) (median concentration: 85 IU/ml, range 11-302 IU/ml). Increased concentrations of IgA-RF were(More)
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