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<http://linkedlifedata.com/resource/pubmed/commentcorrection/4263812-4331212> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Obstet Gynaecol Br Commonw. 1971 Dec;78(12):1096-107" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/4263812-4331212> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/4331212> .