INTERNATIONAL JOURNAL OF RESPIRATION, Volume 26, Issue 6,2006, Pages 477-478, doi:10.3760/cma.j.issn.1673-436X.2006.06.024
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 26, Issue 6,2006, Pages 428-430, doi:10.3760/cma.j.issn.1673-436X.2006.06.009