NATIONAL MEDICAL JOURNAL OF CHINA, Volume 84, Issue 19,2004, Pages 1645-1648, doi:10.3760/j:issn:0376-2491.2004.19.017
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 84, Issue 19,2004, Pages 1629-1632, doi:10.3760/j:issn:0376-2491.2004.19.013
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