INTERNATIONAL JOURNAL OF RESPIRATION, Volume 31, Issue 7,2011, Pages 551-553, doi:10.3760/cma.j.issn.1673-436X.2011.007.018
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 31, Issue 7,2011, Pages 507-511, doi:10.3760/cma.j.issn.1673-436X.2011.007.007
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 31, Issue 7,2011, Pages 557-560, doi:10.3760/cma.j.issn.1673-436X.2011.007.020