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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18475377-3303942> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Obstet Gynecol. 1987 Aug;157(2):491-7" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18475377-3303942> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/3303942> .