NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 4,1998, , doi:10.3760/j:issn:0376-2491.1998.04.001
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 4,1998, , doi:10.3760/j:issn:0376-2491.1998.04.003
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 4,1998, , doi:10.3760/j:issn:0376-2491.1998.04.032
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 4,1998, , doi:10.3760/j:issn:0376-2491.1998.04.016
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 4,1998, , doi:10.3760/j:issn:0376-2491.1998.04.005