Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 4,2018, Pages 221-226, doi:10.3760/cma.j.issn.0529-567x.2018.04.003
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 4,2018, Pages 248-256, doi:10.3760/cma.j.issn.0529-567x.2018.04.008
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 4,2018, Pages 273, doi:10.3760/cma.j.issn.0529-567x.2018.04.012
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 4,2018, Pages 257-262, doi:10.3760/cma.j.issn.0529-567x.2018.04.009
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 4,2018, Pages 217-218, doi:10.3760/cma.j.issn.0529-567x.2018.04.001