Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 9,2019, Pages 634-635, doi:10.3760/cma.j.issn.0529-567x.2019.09.012
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 9,2019, Pages 615-619, doi:10.3760/cma.j.issn.0529-567x.2019.09.007
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 9,2019, Pages 645-648, doi:10.3760/cma.j.issn.0529-567x.2019.09.015
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 9,2019, Pages 581,