Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 8,2019, Pages 534-540, doi:10.3760/cma.j.issn.0529-567x.2019.08.006
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 8,2019, Pages 527-533, doi:10.3760/cma.j.issn.0529-567x.2019.08.005
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 8,2019, Pages 548-551, doi:10.3760/cma.j.issn.0529-567x.2019.08.008
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 8,2019, Pages 522-526, doi:10.3760/cma.j.issn.0529-567x.2019.08.004
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 8,2019, Pages 552-556, doi:10.3760/cma.j.issn.0529-567x.2019.08.009