CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 12,2007, Pages 822-825, doi:10.3760/j.issn:0529-567x.2007.12.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 12,2007, Pages 856-858, doi:10.3760/j.issn:0529-567x.2007.12.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 12,2007, Pages 846-851, doi:10.3760/j.issn:0529-567x.2007.12.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 12,2007, Pages 793-794, doi:10.3760/j.issn:0529-567x.2007.12.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 12,2007, Pages 795-796, doi:10.3760/j.issn:0529-567x.2007.12.002