NATIONAL MEDICAL JOURNAL OF CHINA, Volume 83, Issue 9,2003, Pages 799-800, doi:10.3760/j:issn:0376-2491.2003.09.026
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NATIONAL MEDICAL JOURNAL OF CHINA, Volume 83, Issue 9,2003, Pages 748-752, doi:10.3760/j:issn:0376-2491.2003.09.013
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 83, Issue 9,2003, Pages 740-743, doi:10.3760/j:issn:0376-2491.2003.09.011
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 83, Issue 9,2003, Pages 791-795, doi:10.3760/j:issn:0376-2491.2003.09.024