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To assess the genetic effect on the occurrence of rheumatoid arthritis (RA) associated autoantibodies.A co-twin control study of 27 monozygotic (MZ) and 51 dizygotic same sexed (DZss) RA discordant twins. Outcome measures: The probandwise concordance rate of anti-keratin antibodies (AKA), anti-cyclic citrullinated peptide antibodies (ACPA), IgA- and IgM rheumatoid factor (IgA-RF and IgM-RF). The odds...
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