Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 3,2018, Pages 207-210, doi:10.3760/cma.j.issn.0529-567x.2018.03.014
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 3,2018, Pages 167-171, doi:10.3760/cma.j.issn.0529-567x.2018.03.005
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 3,2018, Pages 172-177, doi:10.3760/cma.j.issn.0529-567x.2018.03.006
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 3,2018, Pages 211-216, doi:10.3760/cma.j.issn.0529-567x.2018.03.015
Chinese Journal of Obstetrics and Gynecology, Volume 53, Issue 3,2018, Pages 145-148, doi:10.3760/cma.j.issn.0529-567x.2018.03.001