NATIONAL MEDICAL JOURNAL OF CHINA, Volume 87, Issue 38,2007, Pages 2689-2692, doi:10.3760/j.issn:0376-2491.2007.38.007
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 87, Issue 38,2007, Pages 2693-2697, doi:10.3760/j.issn:0376-2491.2007.38.008