CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 8,2004, Pages 549-550, doi:10.3760/j.issn:0529-567X.2004.08.013
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 8,2004, Pages 553, doi:10.3760/j.issn:0529-567X.2004.08.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 8,2004, Pages 551-552, doi:10.3760/j.issn:0529-567X.2004.08.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 8,2004, Pages 561-562, doi:10.3760/j.issn:0529-567X.2004.08.020
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 8,2004, Pages 538-542, doi:10.3760/j.issn:0529-567X.2004.08.010