CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 9,2004, Pages 591-594, doi:10.3760/j.issn:0529-567X.2004.09.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 9,2004, Pages 602-605, doi:10.3760/j.issn:0529-567X.2004.09.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 9,2004, Pages 616-619, doi:10.3760/j.issn:0529-567X.2004.09.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 9,2004, Pages 579-581, doi:10.3760/j.issn:0529-567X.2004.09.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 9,2004, Pages 577-578, doi:10.3760/j.issn:0529-567X.2004.09.001