Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 6,2012, Pages 405-411, doi:10.3760/cma.j.issn.0529-567x.2012.06.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 6,2012, Pages 440-444, doi:10.3760/cma.j.issn.0529-567x.2012.06.009
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 6,2012, Pages 470-472, doi:10.3760/cma.j.issn.0529-567x.2012.06.016
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 6,2012, Pages 401-404, doi:10.3760/cma.j.issn.0529-567x.2012.06.001
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 6,2012, Pages 467-469, doi:10.3760/cma.j.issn.0529-567x.2012.06.015