Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 8,2018, Pages 517-521, doi:10.3760/cma.j.issn.0529-567x.2018.08.002
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 8,2018, Pages 554-560, doi:10.3760/cma.j.issn.0529-567x.2018.08.008
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 8,2018, Pages 573-576, doi:10.3760/cma.j.issn.0529-567x.2018.08.013
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 8,2018, Pages 534-539, doi:10.3760/cma.j.issn.0529-567x.2018.08.005
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 8,2018, Pages 564-566, doi:10.3760/cma.j.issn.0529-567x.2018.08.010