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FOREIGN MEDICAL SCIENCES(SECTION OF RESPIRATORY SYSTEM), Volume 23, Issue 3,2003, Pages 120-124, doi:10.3760/cma.j.issn.1673-436X.2003.03.003
FOREIGN MEDICAL SCIENCES(SECTION OF RESPIRATORY SYSTEM), Volume 23, Issue 3,2003, Pages 147-149,153, doi:10.3760/cma.j.issn.1673-436X.2003.03.011