Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 11,2012, Pages 855-857, doi:10.3760/cma.j.issn.0529-567x.2012.11.012
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 11,2012, Pages 839-845, doi:10.3760/cma.j.issn.0529-567x.2012.11.009
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 11,2012, Pages 804-807, doi:10.3760/cma.j.issn.0529-567x.2012.11.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 11,2012, Pages 876-878, doi:10.3760/cma.j.issn.0529-567x.2012.11.020
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 11,2012, Pages 857-859, doi:10.3760/cma.j.issn.0529-567x.2012.11.013