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Can anti-cyclic citrullinated peptide antibody-negative RA be subdivided into clinical subphenotypes?

Diederik PC De Rooy*, Annemiek Willemze, Bart Mertens, Tom WJ Huizinga and Annette HM Van der Helm-van Mil

Arthritis Research & Therapy 2011, 13:R180  doi:10.1186/ar3505

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