NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 20,2001, Pages 1218-1219, doi:10.3760/j:issn:0376-2491.2001.20.002
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 20,2001, Pages 1241,
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 20,2001, Pages 1224-1226, doi:10.3760/j:issn:0376-2491.2001.20.004