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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 31,2010, Pages 2198-2200, doi:10.3760/cma.j.issn.0376-2491.2010.31.009
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 90, Issue 31,2010, Pages 2215-2218, doi:10.3760/cma.j.issn.0376-2491.2010.31.014