International Journal of Respiration, Volume 31, Issue 20,2011, Pages 1553-1556, doi:10.3760/cma.j.issn.1673-436X.2011.020.009
International Journal of Respiration, Volume 31, Issue 20,2011, Pages 1564-1567, doi:10.3760/cma.j.issn.1673-436X.2011.020.012
International Journal of Respiration, Volume 31, Issue 20,2011, Pages 1557-1560, doi:10.3760/cma.j.issn.1673-436X.2011.020.010
International Journal of Respiration, Volume 31, Issue 20,2011, Pages 1579-1582, doi:10.3760/cma.j.issn.1673-436X.2011.020.015
International Journal of Respiration, Volume 31, Issue 20,2011, Pages 1526-1529, doi:10.3760/cma.j.issn.1673-436X.2011.020.002