International Journal of Respiration, Volume 33, Issue 21,2013, Pages 1613-1616, doi:10.3760/cma.j.issn.1673-436X.2013.021.004
International Journal of Respiration, Volume 33, Issue 21,2013, Pages 1631-1634, doi:10.3760/cma.j.issn.1673-436X.2013.021.008
International Journal of Respiration, Volume 33, Issue 21,2013, Pages 1642-1646, doi:10.3760/cma.j.issn.1673-436X.2013.021.011
International Journal of Respiration, Volume 33, Issue 21,2013, Pages 1653-1656, doi:10.3760/cma.j.issn.1673-436X.2013.021.014
International Journal of Respiration, Volume 33, Issue 21,2013, Pages 1610-1612, doi:10.3760/cma.j.issn.1673-436X.2013.021.003