Chinese Journal of Obstetrics and Gynecology, Volume 55, Issue 1,2020, Pages 70, doi:10.3760/cma.j.issn.0529-567X.2020.01.016
Chinese Journal of Obstetrics and Gynecology, Volume 55, Issue 1,2020, Pages 57-58, doi:10.3760/cma.j.issn.0529-567X.2020.01.011
Chinese Journal of Obstetrics and Gynecology, Volume 55, Issue 1,2020, Pages 15-20, doi:10.3760/cma.j.issn.0529-567X.2020.01.004
Chinese Journal of Obstetrics and Gynecology, Volume 55, Issue 1,2020, Pages 60-61, doi:10.3760/cma.j.issn.0529-567X.2020.01.013
Chinese Journal of Obstetrics and Gynecology, Volume 55, Issue 1,2020, Pages 9-14, doi:10.3760/cma.j.issn.0529-567X.2020.01.003