Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 8,2013, Pages 607-610, doi:10.3760/cma.j.issn.0529-567x.2013.08.010
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 8,2013, Pages 584-588, doi:10.3760/cma.j.issn.0529-567x.2013.08.006
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 8,2013, Pages 627-628, doi:10.3760/cma.j.issn.0529-567x.2013.08.015
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 8,2013, Pages 618-621, doi:10.3760/cma.j.issn.0529-567x.2013.08.012
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 8,2013, Pages 570-574, doi:10.3760/cma.j.issn.0529-567x.2013.08.003