CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 6,2004, Pages 419-422, doi:10.3760/j.issn:0529-567X.2004.06.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 6,2004, Pages 415-416, doi:10.3760/j.issn:0529-567X.2004.06.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 6,2004, Pages 361-364, doi:10.3760/j.issn:0529-567X.2004.06.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 6,2004, Pages 385-389, doi:10.3760/j.issn:0529-567X.2004.06.007
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 6,2004, Pages 396-399, doi:10.3760/j.issn:0529-567X.2004.06.009