The PTPN22 1858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden

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Heidi Kokkonen, Martin Johansson, Lena Innala, Erik Jidell and Solbritt Rantapää-Dahlqvist^*

* Corresponding author: Solbritt Rantapää-Dahlqvist solbritt.rantapaa.dahlqvist@medicin.umu.se

Arthritis Research & Therapy 2007, 9:R56 doi:10.1186/ar2214

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