INTERNATIONAL JOURNAL OF RESPIRATION, Volume 27, Issue 17,2007, Pages 1305-1308, doi:10.3760/cma.j.issn.1673-436X.2007.17.008
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INTERNATIONAL JOURNAL OF RESPIRATION, Volume 27, Issue 17,2007, Pages 1356-1360, doi:10.3760/cma.j.issn.1673-436X.2007.17.023
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