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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21032361-13402821> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Obstet Gynecol. 1957 Mar;73(3):492-506" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21032361-13402821> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/13402821> .