Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 275,
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 232-238, doi:10.3760/cma.j.issn.0529-567x.2019.04.004
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 262-265, doi:10.3760/cma.j.issn.0529-567x.2019.04.009
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 226-231, doi:10.3760/cma.j.issn.0529-567x.2019.04.003
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 239-244, doi:10.3760/cma.j.issn.0529-567x.2019.04.005