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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 35,2009, Pages 2468-2471, doi:10.3760/cma.j.issn.0376-2491.2009.35.006
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 35,2009, Pages 2500-2503, doi:10.3760/cma.j.issn.0376-2491.2009.35.014
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 35,2009, Pages 2495-2499, doi:10.3760/cma.j.issn.0376-2491.2009.35.013