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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 93, Issue 45,2013, Pages 3577-3581, doi:10.3760/cma.j.issn.0376-2491.2013.45.003
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 93, Issue 45,2013, Pages 3632-3635, doi:10.3760/cma.j.issn.0376-2491.2013.45.019