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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21689447-17321219> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Contemp Clin Trials. 2007 Jul;28(4):487-99" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21689447-17321219> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/17321219> .