NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 9,2001, Pages 520-522, doi:10.3760/j:issn:0376-2491.2001.09.003
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 9,2001, Pages 544-548, doi:10.3760/j:issn:0376-2491.2001.09.010
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 9,2001, Pages 528-531, doi:10.3760/j:issn:0376-2491.2001.09.005
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 9,2001, Pages 536-537, doi:10.3760/j:issn:0376-2491.2001.09.007