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. 2015 Mar 19;5:9259. doi: 10.1038/srep09259

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CP: (a) osteoarthritis and (b) rheumatoid arthritis. Hyp: (c) osteoarthritis and (d) rheumatoid arthritis. Data are median (lower – upper quartile); for eOA, n = 16; aOA, n = 17, eRA, n = 10 and aRA, n = 22. Lines joint median estimates in plasma/serum to synovial fluid from the same subject groups.