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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 38,2010, Pages 2718-2722, doi:10.3760/cma.j.issn.0376-2491.2010.38.015
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 38,2010, Pages 2679-2683, doi:10.3760/cma.j.issn.0376-2491.2010.38.005