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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 14,2009, Pages 962-966, doi:10.3760/cma.j.issn.0376-2491.2009.14.008
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 14,2009, Pages 967-969, doi:10.3760/cma.j.issn.0376-2491.2009.14.009
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