International Journal of Respiration, Volume 33, Issue 7,2013, Pages 499-502, doi:10.3760/cma.j.issn.1673-436X.2013.007.006
International Journal of Respiration, Volume 33, Issue 7,2013, Pages 533-536, doi:10.3760/cma.j.issn.1673-436X.2013.007.014
International Journal of Respiration, Volume 33, Issue 7,2013, Pages 503-507, doi:10.3760/cma.j.issn.1673-436X.2013.007.007
International Journal of Respiration, Volume 33, Issue 7,2013, Pages 513-517, doi:10.3760/cma.j.issn.1673-436X.2013.007.009
International Journal of Respiration, Volume 33, Issue 7,2013, Pages 548-550, doi:10.3760/cma.j.issn.1673-436X.2013.007.018