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CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 21,2009, Pages 70,73, doi:10.3760/cma.j.issn.1673-4904.2009.21.031
CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 21,2009, Pages 27-28, doi:10.3760/cma.j.issn.1673-4904.2009.21.010