INTERNATIONAL JOURNAL OF RESPIRATION, Volume 27, Issue 1,2007, Pages 23-25, doi:10.3760/cma.j.issn.1673-436X.2007.01.007
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 27, Issue 1,2007, Pages 60-63, doi:10.3760/cma.j.issn.1673-436X.2007.01.017