Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 12,2019, Pages 797-802, doi:10.3760/cma.j.issn.0529-567x.2019.12.002
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 12,2019, Pages 854-857, doi:10.3760/cma.j.issn.0529-567x.2019.12.010
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 12,2019, Pages 848-853, doi:10.3760/cma.j.issn.0529-567x.2019.12.009
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 12,2019, Pages 793-796, doi:10.3760/cma.j.issn.0529-567x.2019.12.001