Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 9,2018, Pages 654-656, doi:10.3760/cma.j.issn.0529-567x.2018.09.017
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 9,2018, Pages 602-607, doi:10.3760/cma.j.issn.0529-567x.2018.09.004
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 9,2018, Pages 608-612, doi:10.3760/cma.j.issn.0529-567x.2018.09.005
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 9,2018, Pages 620-624, doi:10.3760/cma.j.issn.0529-567x.2018.09.007
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 9,2018, Pages 613-619, doi:10.3760/cma.j.issn.0529-567x.2018.09.006