INTERNATIONAL JOURNAL OF RESPIRATION, Volume 29, Issue 4,2009, Pages 197-200, doi:10.3760/cma.j.issn.1673-436X.2009.04.002
INTERNATIONAL JOURNAL OF RESPIRATION, Volume 29, Issue 4,2009, Pages 193-196, doi:10.3760/cma.j.issn.1673-436X.2009.04.001
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 29, Issue 4,2009, Pages 231-233, doi:10.3760/cma.j.issn.1673-436X.2009.04.010