CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 1,2000, Pages 17-19, doi:10.3760/j.issn:0529-567X.2000.01.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 1,2000, Pages 32-35, doi:10.3760/j.issn:0529-567X.2000.01.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 1,2000, Pages 29-31, doi:10.3760/j.issn:0529-567X.2000.01.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 1,2000, Pages 45-47, doi:10.3760/j.issn:0529-567X.2000.01.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 1,2000, Pages 61-62, doi:10.3760/j.issn:0529-567X.2000.01.021