Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 10,2013, Pages 734-739, doi:10.3760/cma.j.issn.0529-567x.2013.10.004
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 10,2013, Pages 728-733, doi:10.3760/cma.j.issn.0529-567x.2013.10.003
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 10,2013, Pages 768-771, doi:10.3760/cma.j.issn.0529-567x.2013.10.011
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 10,2013, Pages 763-767, doi:10.3760/cma.j.issn.0529-567x.2013.10.010
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 10,2013, Pages 745-749, doi:10.3760/cma.j.issn.0529-567x.2013.10.006