Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 7,2017, Pages 436-442, doi:10.3760/cma.j.issn.0529-567x.2017.07.002
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 7,2017, Pages 499-502, doi:10.3760/cma.j.issn.0529-567x.2017.07.014
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 7,2017, Pages 467-472, doi:10.3760/cma.j.issn.0529-567x.2017.07.007
Chinese Journal of Obstetrics and Gynecology, Volume 52, Issue 7,2017, Pages 461-466, doi:10.3760/cma.j.issn.0529-567x.2017.07.006