Chinese Journal of Perinatal Medicine, Volume 22, Issue 7,2019, Pages 488-494, doi:10.3760/cma.j.issn.1007-9408.2019.07.012
Chinese Journal of Perinatal Medicine, Volume 22, Issue 7,2019, Pages 485-487, doi:10.3760/cma.j.issn.1007-9408.2019.07.011
Chinese Journal of Perinatal Medicine, Volume 22, Issue 7,2019, Pages 472-478, doi:10.3760/cma.j.issn.1007-9408.2019.07.009
Chinese Journal of Perinatal Medicine, Volume 22, Issue 7,2019, Pages 500-501, doi:10.3760/cma.j.issn.1007-9408.2019.07.014