Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 09,2011, Pages 644-648, Dol:10.3760/cma.j.issn.0529-567x.2011.09.002
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 09,2011, Pages 649-654, Dol:10.3760/cma.j.issn.0529-567x.2011.09.003
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 09,2011, Pages 655-657, Dol:10.3760/cma.J.Issn.0529-567x.2011.09.004
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 09,2011, Pages 658-663, Dol:10.3760/cma.J.issn.0529-567x.2011.09.005
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 09,2011, Pages 664-668, Dol:10.3760/cma.j.issn.0529-567x.2011.09.006