Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 2,2018, Pages 139-142, doi:10.3760/cma.j.issn.0529-567x.2018.02.019
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 2,2018, Pages 143-144, doi:10.3760/cma.j.issn.0529-567x.2018.02.020
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 2,2018, Pages 106-110, doi:10.3760/cma.j.issn.0529-567x.2018.02.007
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 2,2018, Pages 118-120, doi:10.3760/cma.j.issn.0529-567x.2018.02.010
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 2,2018, Pages 77-81, doi:10.3760/cma.j.issn.0529-567x.2018.02.002