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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21712920-12668793> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Thorax. 2003 Apr;58(4):311-6" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21712920-12668793> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/12668793> .