CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 9,2001, Pages 539-541, doi:10.3760/j.issn:0529-567X.2001.09.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 9,2001, Pages 563-564, doi:10.3760/j.issn:0529-567X.2001.09.019
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 9,2001, Pages 523-526, doi:10.3760/j.issn:0529-567X.2001.09.003
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 9,2001, Pages 536-538, doi:10.3760/j.issn:0529-567X.2001.09.007
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 9,2001, Pages 546-548, doi:10.3760/j.issn:0529-567X.2001.09.010