Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 11,2018, Pages 779-782, doi:10.3760/cma.j.issn.0529-567x.2018.11.009
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 11,2018, Pages 761-767, doi:10.3760/cma.j.issn.0529-567x.2018.11.006
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 11,2018, Pages 790-793, doi:10.3760/cma.j.issn.0529-567x.2018.11.015
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 11,2018, Pages 787-789, doi:10.3760/cma.j.issn.0529-567x.2018.11.014
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 11,2018, Pages 797-800, doi:10.3760/cma.j.issn.0529-567x.2018.11.017