Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 6,2013, Pages 466-468, doi:10.3760/cma.j.issn.0529-567x.2013.06.016
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 6,2013, Pages 469-472, doi:10.3760/cma.j.issn.0529-567x.2013.06.017
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 6,2013, Pages 411-415, doi:10.3760/cma.j.issn.0529-567x.2013.06.003
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 6,2013, Pages 421-426, doi:10.3760/cma.j.issn.0529-567x.2013.06.005
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 6,2013, Pages 459-461, doi:10.3760/cma.j.issn.0529-567x.2013.06.013