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The likelihood of persistent arthritis increases with the level of anti-citrullinated peptide antibody and immunoglobulin M rheumatoid factor: a longitudinal study of 376 patients with very early undifferentiated arthritis

Maria D Mjaavatten*, Désirée van der Heijde, Till Uhlig, Anne J Haugen, Halvor Nygaard, Göran Sidenvall, Knut Helgetveit and Tore K Kvien

Arthritis Research & Therapy 2010, 12:R76  doi:10.1186/ar2995