Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 8,2014, Pages 570-572, doi:10.3760/cma.j.issn.0529-567x.2014.08.002
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 8,2014, Pages 576-578, doi:10.3760/cma.j.issn.0529-567x.2014.08.004
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 8,2014, Pages 634, doi:10.3760/cma.j.issn.0529-567x.2014.08.018
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 8,2014, Pages 584-587, doi:10.3760/cma.j.issn.0529-567x.2014.08.006
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 8,2014, Pages 573-575, doi:10.3760/cma.j.issn.0529-567x.2014.08.003