International Journal of Respiration, Volume 33, Issue 4,2013, Pages 294-296, doi:10.3760/cma.j.issn.1673-436X.2013.004.013
International Journal of Respiration, Volume 33, Issue 4,2013, Pages 260,264,269,278,287,293,296,305,311,
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International Journal of Respiration, Volume 33, Issue 4,2013, Pages 301-305, doi:10.3760/cma.j.issn.1673-436X.2013.004.015
International Journal of Respiration, Volume 33, Issue 4,2013, Pages 297-300, doi:10.3760/cma.j.issn.1673-436X.2013.004.014