International Journal of Respiration, Volume 32, Issue 6,2012, Pages 450-454, doi:10.3760/cma.j.issn.1673-436X.2012.006.013
International Journal of Respiration, Volume 32, Issue 6,2012, Pages 465-469, doi:10.3760/cma.j.issn.1673-436X.2012.006.016
International Journal of Respiration, Volume 32, Issue 6,2012, Pages 435-438, doi:10.3760/cma.j.issn.1673-436X.2012.006.009
International Journal of Respiration, Volume 32, Issue 6,2012, Pages 409-412, doi:10.3760/cma.j.issn.1673-436X.2012.006.003
International Journal of Respiration, Volume 32, Issue 6,2012, Pages 476-479, doi:10.3760/cma.j.issn.1673-436X.2012.006.018