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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21224326-19031473> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Ultrasound Obstet Gynecol. 2009 Jan;33(1):18-22" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21224326-19031473> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/19031473> .