Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 9,2017, Pages 637-639, doi:10.3760/cma.j.issn.0529-567x.2017.09.015
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 9,2017, Pages 612-617, doi:10.3760/cma.j.issn.0529-567x.2017.09.007
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 9,2017, Pages 644-648, doi:10.3760/cma.j.issn.0529-567x.2017.09.017
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 9,2017, Pages 640-643, doi:10.3760/cma.j.issn.0529-567x.2017.09.016
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 9,2017, Pages 636, doi:10.3760/cma.j.issn.0529-567x.2017.09.014