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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 8,2009, Pages 575, doi:10.3760/cma.j.issn.0376-2491.2009.08.024
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 8,2009, Pages 555-558, doi:10.3760/cma.j.issn.0376-2491.2009.08.018