INTERNATIONAL JOURNAL OF RESPIRATION, Volume 28, Issue 20,2008, Pages 1246-1251, doi:10.3760/cma.j.issn.1673-436X.2008.20.009
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 28, Issue 20,2008, Pages 1271-1276, doi:10.3760/cma.j.issn.1673-436X.2008.20.015
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