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Promoter polymorphisms in the chitinase 3-like 1 gene influence the serum concentration of YKL-40 in Danish patients with rheumatoid arthritis and in healthy subjects

Kaspar R Nielsen*, Rudi Steffensen, Martin Boegsted, John Baech, Soeren Lundbye-Christensen, Merete L Hetland, Sophine B Krintel, Hans E Johnsen, Mette Nyegaard and Julia S Johansen

Arthritis Research & Therapy 2011, 13:R109 doi:10.1186/ar3391

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