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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21383914-18434449> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Ann Rheum Dis. 2009 Apr;68(4):477-83" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21383914-18434449> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/18434449> .