Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 6,2019, Pages 369-374, doi:10.3760/cma.j.issn.0529-567x.2019.06.003
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 6,2019, Pages 393-398, doi:10.3760/cma.j.issn.0529-567x.2019.06.007
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 6,2019, Pages 375-380, doi:10.3760/cma.j.issn.0529-567x.2019.06.004
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 6,2019, Pages 387-392, doi:10.3760/cma.j.issn.0529-567x.2019.06.006
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 6,2019, Pages 420,