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Percentage of positive anti‐citrullinated protein antibodies (ACPA) immunoglobulin (Ig)G, IgA, IgM and secretory IgA (SIgA) rheumatoid arthritis (RA) patients at inclusion and during the 36 months of follow‐up. *P < 0·05 and **P < 0·01 (McNemar test).
