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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21167034-20638237> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Clin Epidemiol. 2011 Apr;64(4):431-5" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21167034-20638237> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/20638237> .