Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 6,2018, Pages 384-389, doi:10.3760/cma.j.issn.0529-567x.2018.06.005
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 6,2018, Pages 364-370, doi:10.3760/cma.j.issn.0529-567x.2018.06.002
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 6,2018, Pages 371-376, doi:10.3760/cma.j.issn.0529-567x.2018.06.003
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 6,2018, Pages 390-395, doi:10.3760/cma.j.issn.0529-567x.2018.06.006
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 6,2018, Pages 409-413, doi:10.3760/cma.j.issn.0529-567x.2018.06.009