Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 9,2011, Pages 644-648, doi:10.3760/cma.j.issn.0529-567x.2011.09.002
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 720, doi:10.3760/cma.j.issn.0529-567x.2011.09.021
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 709-711, doi:10.3760/cma.j.issn.0529-567x.2011.09.017