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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 4,2009, Pages 217-219, doi:10.3760/cma.j.issn.0376-2491.2009.04.001
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 4,2009, Pages 276-279, doi:10.3760/cma.j.issn.0376-2491.2009.04.016