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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21412874-18646076> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Cochrane Database Syst Rev. 2008;(3):CD001727" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21412874-18646076> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/18646076> .