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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18475407-7243099> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Obstet Gynecol. 1981 Apr;57(4):487-9" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18475407-7243099> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/7243099> .