Chinese Journal of Perinatal Medicine, Volume 22, Issue 6,2019, Pages 385-390, doi:10.3760/cma.j.issn.1007-9408.2018.06.003.1
Chinese Journal of Perinatal Medicine, Volume 22, Issue 6,2019, Pages 361-380, doi:10.3760/cma.j.issn.1007-9408.2019.06.001
Chinese Journal of Perinatal Medicine, Volume 22, Issue 6,2019, Pages 412-419, doi:10.3760/cma.j.issn.1007-9408.2019.06.008
Chinese Journal of Perinatal Medicine, Volume 22, Issue 6,2019, Pages 424-428, doi:10.3760/cma.j.issn.1007-9408.2019.06.010