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<http://linkedlifedata.com/resource/pubmed/commentcorrection/4077715-7454692> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Placenta. 1980 Oct-Dec;1(4):345-53" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/4077715-7454692> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/7454692> .