CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 685, doi:10.3760/j.issn:0529-567X.2000.11.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 696, doi:10.3760/j.issn:0529-567X.2000.11.021
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 686, doi:10.3760/j.issn:0529-567X.2000.11.034
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 650, doi:10.3760/j.issn:0529-567X.2000.11.025
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 657, doi:10.3760/j.issn:0529-567X.2000.11.005