CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 34,2009, Pages 15-17, doi:10.3760/cma.j.issn.1673-4904.2009.34.005
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CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 34,2009, Pages 6-8, doi:10.3760/cma.j.issn.1673-4904.2009.34.002
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