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CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 17,2009, Pages 24-26, doi:10.3760/cma.j.issn.1673-4904.2009.17.008
CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 17,2009, Pages 18-21 , doi:10.3760/cma.j.issn.1673-4904.2009.17.006