Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 7,2013, Pages 519-522, doi:10.3760/cma.j.issn.0529-567x.2013.07.010
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 7,2013, Pages 494-498, doi:10.3760/cma.j.issn.0529-567x.2013.07.004
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 7,2013, Pages 558, doi:10.3760/cma.j.issn.0529-567x.2013.07.022
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 7,2013, Pages 548-550, doi:10.3760/cma.j.issn.0529-567x.2013.07.018
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 7,2013, Pages 508-510, doi:10.3760/cma.j.issn.0529-567x.2013.07.007