Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 11,2014, Pages 878-880, doi:10.3760/cma.j.issn.0529-567x.2014.11.022
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 11,2014, Pages 823-828, doi:10.3760/cma.j.issn.0529-567x.2014.11.005
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 11,2014, Pages 854-856, doi:10.3760/cma.j.issn.0529-567x.2014.11.012
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 11,2014, Pages 807-810, doi:10.3760/cma.j.issn.0529-567x.2014.11.002
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 11,2014, Pages 811-815, doi:10.3760/cma.j.issn.0529-567x.2014.11.003