CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 10,2010, Pages 796-798, doi:10.3760/cma.j.issn.0529-567x.2010.10.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 10,2010, Pages 781-786, doi:10.3760/cma.j.issn.0529-567x.2010.10.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 10,2010, Pages 793-795, doi:10.3760/cma.j.issn.0529-567x.2010.10.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 10,2010, Pages 750-753, doi:10.3760/cma.j.issn.0529-567x.2010.10.007