NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 9,1998, , doi:10.3760/j:issn:0376-2491.1998.09.015
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 9,1998, , doi:10.3760/j:issn:0376-2491.1998.09.024
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 9,1998, , doi:10.3760/j:issn:0376-2491.1998.09.037
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 9,1998, , doi:10.3760/j:issn:0376-2491.1998.09.022
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 9,1998, , doi:10.3760/j:issn:0376-2491.1998.09.014