Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 11,2013, Pages 838-842, doi:10.3760/cma.j.issn.0529-567x.2013.11.009
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 11,2013, Pages 815-818, doi:10.3760/cma.j.issn.0529-567x.2013.11.004
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 11,2013, Pages 810-814, doi:10.3760/cma.j.issn.0529-567x.2013.11.003
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 11,2013, Pages 805-809, doi:10.3760/cma.j.issn.0529-567x.2013.11.002
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 11,2013, Pages 828-832, doi:10.3760/cma.j.issn.0529-567x.2013.11.007