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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21769212-2009801> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Chest. 1991 Apr;99(4):951-5" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21769212-2009801> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/2009801> .