Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 1,2018, Pages 65-70, doi:10.3760/cma.j.issn.0529-567x.2018.01.016
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 1,2018, Pages 51-54, doi:10.3760/cma.j.issn.0529-567x.2018.01.012
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 1,2018, Pages 23-30, doi:10.3760/cma.j.issn.0529-567x.2018.01.006
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 1,2018, Pages 58-61, doi:10.3760/cma.j.issn.0529-567x.2018.01.014
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 1,2018, Pages 2-6, doi:10.3760/cma.j.issn.0529-567x.2018.01.002