International Journal of Respiration, Volume 32, Issue 11,2012, Pages 842-846, doi:10.3760/cma.j.issn.1673-436X.2012.011.010
International Journal of Respiration, Volume 32, Issue 11,2012, Pages 804-807, doi:10.3760/cma.j.issn.1673-436X.2012.011.002
International Journal of Respiration, Volume 32, Issue 11,2012, Pages 854-858, doi:10.3760/cma.j.issn.1673-436X.2012.011.012
International Journal of Respiration, Volume 32, Issue 11,2012, Pages 808-813, doi:10.3760/cma.j.issn.1673-436X.2012.011.003
International Journal of Respiration, Volume 32, Issue 11,2012, Pages 814-819, doi:10.3760/cma.j.issn.1673-436X.2012.011.004