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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 41,2009, Pages 2902-2905, doi:10.3760/cma.j.issn.0376-2491.2009.41.006
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 41,2009, Pages 2924-2927, doi:10.3760/cma.j.issn.0376-2491.2009.41.011