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<http://linkedlifedata.com/resource/pubmed/commentcorrection/7677456-1833683> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Obstet Gynecol. 1991 Oct;78(4):721-3" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/7677456-1833683> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1833683> .