CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 10,2000, Pages 594, doi:10.3760/j.issn:0529-567X.2000.10.006
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 10,2000, Pages 597, doi:10.3760/j.issn:0529-567X.2000.10.007
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 10,2000, Pages 581, doi:10.3760/j.issn:0529-567X.2000.10.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 10,2000, Pages 606, doi:10.3760/j.issn:0529-567X.2000.10.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 10,2000, Pages 591, doi:10.3760/j.issn:0529-567X.2000.10.004