CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 478-481, doi:10.3760/j.issn:0529-567X.2004.07.013
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 495-496, doi:10.3760/j.issn:0529-567X.2004.07.020
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 469-473, doi:10.3760/j.issn:0529-567X.2004.07.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 7,2004, Pages 482-485, doi:10.3760/j.issn:0529-567X.2004.07.014