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<http://linkedlifedata.com/resource/pubmed/commentcorrection/2273353-2661728> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Clin Epidemiol. 1989;42(6):491-6; discussion 497-8" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/2273353-2661728> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/2661728> .