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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18316157-7225303> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Br J Obstet Gynaecol. 1981 Apr;88(4):434-42" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18316157-7225303> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/7225303> .