Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 2,2014, Pages 150, doi:10.3760/cma.j.issn.0529-567x.2014.02.017
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 2,2014, Pages 120-124, doi:10.3760/cma.j.issn.0529-567x.2014.02.009
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 2,2014, Pages 89-93, doi:10.3760/cma.j.issn.0529-567x.2014.02.003
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 2,2014, Pages 140-142, doi:10.3760/cma.j.issn.0529-567x.2014.02.014
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 2,2014, Pages 104-108, doi:10.3760/cma.j.issn.0529-567x.2014.02.006