International Journal of Respiration, , Issue 22,2015, Pages 1756-1760, doi:10.3760/cma.j.issn.1673-436X.2015.22.019
International Journal of Respiration, , Issue 22,2015, Pages 1739-1743, doi:10.3760/cma.j.issn.1673-436X.2015.22.015
International Journal of Respiration, , Issue 22,2015, Pages 1707-1710, doi:10.3760/cma.j.issn.1673-436X.2015.22.007