NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 6,1998, , doi:10.3760/j:issn:0376-2491.1998.06.011
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 6,1998, , doi:10.3760/j:issn:0376-2491.1998.06.010
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 6,1998, , doi:10.3760/j:issn:0376-2491.1998.06.008
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 6,1998, , doi:10.3760/j:issn:0376-2491.1998.06.014
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 78, Issue 6,1998, , doi:10.3760/j:issn:0376-2491.1998.06.009