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<http://linkedlifedata.com/resource/pubmed/commentcorrection/19503781-2198921> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Br J Obstet Gynaecol. 1990 Jun;97(6):521-6" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/19503781-2198921> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/2198921> .