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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 40,2009, Pages 2831-2834, doi:10.3760/cma.j.issn.0376-2491.2009.40.006
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 40,2009, Pages 2843-2846, doi:10.3760/cma.j.issn.0376-2491.2009.40.009