International Journal of Respiration, Volume 32, Issue 7,2012, Pages 490-492, doi:10.3760/cma.j.issn.1673-436X.2012.007.003
International Journal of Respiration, Volume 32, Issue 7,2012, Pages 552-556, doi:10.3760/cma.j.issn.1673-436X.2012.007.018
International Journal of Respiration, Volume 32, Issue 7,2012, Pages 509-512, doi:10.3760/cma.j.issn.1673-436X.2012.007.008
International Journal of Respiration, Volume 32, Issue 7,2012, Pages 548-551, doi:10.3760/cma.j.issn.1673-436X.2012.007.017
International Journal of Respiration, Volume 32, Issue 7,2012, Pages 540-544, doi:10.3760/cma.j.issn.1673-436X.2012.007.015