International Journal of Respiration, Volume 32, Issue 2,2012, Pages 147-151, doi:10.3760/cma.j.issn.1673-436X.2012.002.017
International Journal of Respiration, Volume 32, Issue 2,2012, Pages 125-129, doi:10.3760/cma.j.issn.1673-436X.2012.002.012
International Journal of Respiration, Volume 32, Issue 2,2012, Pages 152-156, doi:10.3760/cma.j.issn.1673-436X.2012.002.018
International Journal of Respiration, Volume 32, Issue 2,2012, Pages 99-102, doi:10.3760/cma.j.issn.1673-436X.2012.002.006
International Journal of Respiration, Volume 32, Issue 2,2012, Pages 81-85, doi:10.3760/cma.j.issn.1673-436X.2012.002.001