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 449-452, doi:10.3760/j.issn:0529-567X.2004.07.006
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 490-491, doi:10.3760/j.issn:0529-567X.2004.07.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 478-481, doi:10.3760/j.issn:0529-567X.2004.07.013