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<http://linkedlifedata.com/resource/pubmed/commentcorrection/19921082-4649139> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Clin Obstet Gynecol. 1972 Dec;15(4):1048-54" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/19921082-4649139> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/4649139> .