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<http://linkedlifedata.com/resource/pubmed/commentcorrection/19471561-13766579> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Obstet Gynecol. 1961 Apr;81:752-62" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/19471561-13766579> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/13766579> .