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Correction: The PTPN22 1858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden
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* Corresponding author: Solbritt Rantapää-Dahlqvist solbritt.rantapaa.dahlqvist@medicin.umu.se
Arthritis Research & Therapy 2007, 9:403 doi:10.1186/ar2312