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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 80, Issue 1,2000, Pages 70-71, doi:10.3760/j:issn:0376-2491.2000.01.026
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 80, Issue 1,2000, Pages 15, doi:10.3760/j:issn:0376-2491.2000.01.030