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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18472878-1988876> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Obstet Gynecol. 1991 Feb;77(2):176-80" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18472878-1988876> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1988876> .