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Keystone EC, Wang MM, Layton M, et al. Clinical evaluation of the efficacy of the P2X7 purinergic receptor antagonist AZD9056 on the signs and symptoms of rheumatoid arthritis in patients with active disease despite treatment with methotrexate or sulphasalazine. Ann Rheum Dis 2010;69:1630–5. This was published in the print issue with the incorrect doi 10.1136/ annrheumdis-2011-143578. The correct doi is 10.1136/ard.2010.143578 because this is the doi it was originally published with online first.
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