CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 490-491, doi:10.3760/j.issn:0529-567X.2004.07.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 491-493, doi:10.3760/j.issn:0529-567X.2004.07.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 482-485, doi:10.3760/j.issn:0529-567X.2004.07.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 436-438, doi:10.3760/j.issn:0529-567X.2004.07.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 478-481, doi:10.3760/j.issn:0529-567X.2004.07.013