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 270,
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 265,
Chinese Journal of Obstetrics and Gynecology, Volume 54, Issue 4,2019, Pages 249-254, doi:10.3760/cma.j.issn.0529-567x.2019.04.007