International Journal of Respiration, Volume 32, Issue 10,2012, Pages 749-754, doi:10.3760/cma.j.issn.1673-436X.2012.010.007
International Journal of Respiration, Volume 32, Issue 10,2012, Pages 779-783, doi:10.3760/cma.j.issn.1673-436X.2012.010.013
International Journal of Respiration, Volume 32, Issue 10,2012, Pages 793-797, doi:10.3760/cma.j.issn.1673-436X.2012.010.016
International Journal of Respiration, Volume 32, Issue 10,2012, Pages 737-744, doi:10.3760/cma.j.issn.1673-436X.2012.010.005
International Journal of Respiration, Volume 32, Issue 10,2012, Pages 732-736, doi:10.3760/cma.j.issn.1673-436X.2012.010.004