Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 6,2014, Pages 432-436, doi:10.3760/cma.j.issn.0529-567x.2014.06.008
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 6,2014, Pages 474-476, doi:10.3760/cma.j.issn.0529-567x.2014.06.018
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 6,2014, Pages 477-480, doi:10.3760/cma.j.issn.0529-567x.2014.06.019
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 6,2014, Pages 468-470, doi:10.3760/cma.j.issn.0529-567x.2014.06.016
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 6,2014, Pages 414-418, doi:10.3760/cma.j.issn.0529-567x.2014.06.004