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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 2,2010, Pages 83-86, doi:10.3760/cma.j.issn.0376-2491.2010.02.004
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 2,2010, Pages 100-102, doi:10.3760/cma.j.issn.0376-2491.2010.02.009