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Acute phase reactants add little to composite disease activity indices for rheumatoid arthritis: validation of a clinical activity score

Daniel Aletaha*, Valerie PK Nell, Tanja Stamm, Martin Uffmann, Stephan Pflugbeil, Klaus Machold and Josef S Smolen

Arthritis Research & Therapy 2005, 7:R796-R806  doi:10.1186/ar1740