NATIONAL MEDICAL JOURNAL OF CHINA, Volume 86, Issue 35,2006, Pages 2449-2450, doi:10.3760/j:issn:0376-2491.2006.35.001
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 86, Issue 35,2006, Pages 2451-2454, doi:10.3760/j:issn:0376-2491.2006.35.002
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