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Antibodies of IgG, IgA and IgM isotypes against cyclic citrullinated peptide precede the development of rheumatoid arthritis

Heidi Kokkonen, Mohammed Mullazehi, Ewa Berglin, Göran Hallmans, Göran Wadell, Johan Rönnelid and Solbritt Rantapää-Dahlqvist*

Arthritis Research & Therapy 2011, 13:R13  doi:10.1186/ar3237

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