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MEDICAL EDUCATION(CHINA), , Issue 6,2001, Pages 19-22, doi:10.3760/cma.j.issn.1673-677X.2001.06.006
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MEDICAL EDUCATION(CHINA), , Issue 6,2001, Pages 37-38, doi:10.3760/cma.j.issn.1673-677X.2001.06.012