Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 695-698, doi:10.3760/cma.J.Issn.0529-567x.2011.09.013
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 641-643, doi:10.3760/cma.j.issn.0529-567x.2011.09.001
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 693-695, doi:10.3760/cma.j.issn.0529-567x.2011.09.012
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 684-689, doi:10.3760/cma.j.issn.0529-567x.2011.09.010
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 709-711, doi:10.3760/cma.j.issn.0529-567x.2011.09.017