Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 1,2019, Pages 37, doi:10.3760/cma.j.issn.0529-567x.2019.01.013
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 1,2019, Pages 61-63, doi:10.3760/cma.j.issn.0529-567x.2019.01.016
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 1,2019, Pages 38-43, doi:10.3760/cma.j.issn.0529-567x.2019.01.009
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 1,2019, Pages 44-48, doi:10.3760/cma.j.issn.0529-567x.2019.01.010
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 1,2019, Pages 19-23, doi:10.3760/cma.j.issn.0529-567x.2019.01.005