International Journal of Respiration, Volume 34, Issue 19,2014, Pages 1461-1465, doi:10.3760/cma.j.issn.1673-436X.2014.19.006
International Journal of Respiration, Volume 34, Issue 19,2014, Pages 1498-1503, doi:10.3760/cma.j.issn.1673-436X.2014.19.016
International Journal of Respiration, Volume 34, Issue 19,2014, Pages 1482-1486, doi:10.3760/cma.j.issn.1673-436X.2014.19.012
International Journal of Respiration, Volume 34, Issue 19,2014, Pages 1469-1472, doi:10.3760/cma.j.issn.1673-436X.2014.19.008
International Journal of Respiration, Volume 34, Issue 19,2014, Pages 1458-1460, doi:10.3760/cma.j.issn.1673-436X.2014.19.005