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<http://linkedlifedata.com/resource/pubmed/commentcorrection/20661817-1877602> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Epidemiol. 1991 Aug 15;134(4):421-32" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/20661817-1877602> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1877602> .