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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21364846-18591307> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Obstet Gynecol. 2008 Jul;112(1):49-55" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21364846-18591307> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/18591307> .