International Journal of Respiration, Volume 33, Issue 9,2013, Pages 652-656, doi:10.3760/cma.j.issn.1673-436X.2013.009.003
International Journal of Respiration, Volume 33, Issue 9,2013, Pages 684-688, doi:10.3760/cma.j.issn.1673-436X.2013.009.010
International Journal of Respiration, Volume 33, Issue 9,2013, Pages 718-720, doi:10.3760/cma.j.issn.1673-436X.2013.009.018
International Journal of Respiration, Volume 33, Issue 9,2013, Pages 657-662, doi:10.3760/cma.j.issn.1673-436X.2013.009.004
International Journal of Respiration, Volume 33, Issue 9,2013, Pages 666-670, doi:10.3760/cma.j.issn.1673-436X.2013.009.006