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<http://linkedlifedata.com/resource/pubmed/commentcorrection/19900038-17355892> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Placenta. 2007 Apr;28 Suppl A:S48-50" .
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<http://linkedlifedata.com/resource/pubmed/id/19900038> <http://linkedlifedata.com/resource/pubmed/commentsCorrections> <http://linkedlifedata.com/resource/pubmed/commentcorrection/19900038-17355892> .