International Journal of Respiration, Volume 31, Issue 19,2011, Pages 1475-1478, doi:10.3760/cma.j.issn.1673-436X.2011.019.009
International Journal of Respiration, Volume 31, Issue 19,2011, Pages 1485-1487, doi:10.3760/cma.j.issn.1673-436X.2011.019.012
International Journal of Respiration, Volume 31, Issue 19,2011, Pages 1503-1506, doi:10.3760/cma.j.issn.1673-436X.2011.019.017
International Journal of Respiration, Volume 31, Issue 19,2011, Pages 1492-1495, doi:10.3760/cma.j.issn.1673-436X.2011.019.014
International Journal of Respiration, Volume 31, Issue 19,2011, Pages 1496-1499, doi:10.3760/cma.j.issn.1673-436X.2011.019.015