International Journal of Respiration, Volume 31, Issue 21,2011, Pages 1677-1680, doi:10.3760/cma.j.issn.1673-436X.2011.021.019
International Journal of Respiration, Volume 31, Issue 21,2011, Pages 1654-1658, doi:10.3760/cma.j.issn.1673-436X.2011.021.014
International Journal of Respiration, Volume 31, Issue 21,2011, Pages 1606-1609, doi:10.3760/cma.j.issn.1673-436X.2011.021.002
International Journal of Respiration, Volume 31, Issue 21,2011, Pages 1618-1620, doi:10.3760/cma.j.issn.1673-436X.2011.021.005
International Journal of Respiration, Volume 31, Issue 21,2011, Pages 1625-1628, doi:10.3760/cma.j.issn.1673-436X.2011.021.007