International Journal of Respiration, Volume 33, Issue 19,2013, Pages 1471-1476, doi:10.3760/cma.j.issn.1673-436X.2013.019.009
International Journal of Respiration, Volume 33, Issue 19,2013, Pages 1464-1466, doi:10.3760/cma.j.issn.1673-436X.2013.019.007
International Journal of Respiration, Volume 33, Issue 19,2013, Pages 1467-1470, doi:10.3760/cma.j.issn.1673-436X.2013.019.008
International Journal of Respiration, Volume 33, Issue 19,2013, Pages 1503-1506, doi:10.3760/cma.j.issn.1673-436X.2013.019.016
International Journal of Respiration, Volume 33, Issue 19,2013, Pages 1499-1502, doi:10.3760/cma.j.issn.1673-436X.2013.019.015