Chinese Journal of Obstetrics and Gynecology, Volume 56, Issue 1,2021, Pages 11-14, doi:10.3760/cma.j.cn112141-20201009-00763
Chinese Journal of Obstetrics and Gynecology, Volume 56, Issue 1,2021, Pages 27-33, doi:10.3760/cma.j.cn112141-20200612-00500
Chinese Journal of Obstetrics and Gynecology, Volume 56, Issue 1,2021, Pages 3-6, doi:10.3760/cma.j.cn112141-20200717-00583
Chinese Journal of Obstetrics and Gynecology, Volume 56, Issue 1,2021, Pages 81-84, doi:10.3760/cma.j.cn112141-20200928-00752
Chinese Journal of Obstetrics and Gynecology, Volume 56, Issue 1,2021, Pages 77-80, doi:10.3760/cma.j.cn112141-20200707-00559