Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 7,2018, Pages 459-463, doi:10.3760/cma.j.issn.0529-567x.2018.07.004
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 7,2018, Pages 487-489, doi:10.3760/cma.j.issn.0529-567x.2018.07.008
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 7,2018, Pages 448-451, doi:10.3760/cma.j.issn.0529-567x.2018.07.002
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 7,2018, Pages 464-470, doi:10.3760/cma.j.issn.0529-567x.2018.07.005
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 7,2018, Pages 481-486, doi:10.3760/cma.j.issn.0529-567x.2018.07.007