Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 10,2014, Pages 754-757, doi:10.3760/cma.j.issn.0529-567x.2014.10.008
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 10,2014, Pages 772-775, doi:10.3760/cma.j.issn.0529-567x.2014.10.012
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 10,2014, Pages 768-771, doi:10.3760/cma.j.issn.0529-567x.2014.10.011
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 10,2014, Pages 725-727, doi:10.3760/cma.j.issn.0529-567x.2014.10.002
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 10,2014, Pages 749-753, doi:10.3760/cma.j.issn.0529-567x.2014.10.007