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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18848617-11978072> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Placenta. 2002 Apr;23 Suppl A:S136-41" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18848617-11978072> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/11978072> .