Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 12,2012, Pages 898-904, doi:10.3760/cma.j.issn.0529-567x.2012.12.005
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 12,2012, Pages 883-887, doi:10.3760/cma.j.issn.0529-567x.2012.12.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 12,2012, Pages 957-958, doi:10.3760/cma.j.issn.0529-567x.2012.12.022
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 12,2012, Pages 905-909, doi:10.3760/cma.j.issn.0529-567x.2012.12.006
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 12,2012, Pages 893-897, doi:10.3760/cma.j.issn.0529-567x.2012.12.004