NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 22,2001, Pages 1399-1400, doi:10.3760/j:issn:0376-2491.2001.22.019
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 22,2001, Pages 1407, doi:10.3760/j:issn:0376-2491.2001.22.024
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 22,2001, Pages 1387-1389, doi:10.3760/j:issn:0376-2491.2001.22.013