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<http://linkedlifedata.com/resource/pubmed/commentcorrection/9637715-6622431> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Placenta. 1983 Jul-Sep;4(3):271-7" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/9637715-6622431> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/6622431> .