Chinese Journal of Perinatal Medicine, Volume 22, Issue 8,2019, Pages 553-559, doi:10.3760/cma.j.issn.1007-9408.2019.08.004
Chinese Journal of Perinatal Medicine, Volume 22, Issue 8,2019, Pages 540-549, doi:10.3760/cma.j.issn.1007-9408.2019.08.002
Chinese Journal of Perinatal Medicine, Volume 22, Issue 8,2019, Pages 550-552, doi:10.3760/cma.j.issn.1007-9408.2019.08.003