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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21651772-19378224> <http://linkedlifedata.com/resource/pubmed/referenceSource> "COPD. 2009 Apr;6(2):112-20" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21651772-19378224> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/19378224> .