Chinese Journal of Perinatal Medicine, Volume 21, Issue 6,2018, Pages 367-375, doi:10.3760/cma.j.issn.1007-9408.2018.06.003
Chinese Journal of Perinatal Medicine, Volume 21, Issue 6,2018, Pages 427-429, doi:10.3760/cma.j.issn.1007-9408.2018.06.013
Chinese Journal of Perinatal Medicine, Volume 21, Issue 6,2018, Pages 381-387, doi:10.3760/cma.j.issn.1007-9408.2018.06.005
Chinese Journal of Perinatal Medicine, Volume 21, Issue 6,2018, Pages 394-400, doi:10.3760/cma.j.issn.1007-9408.2018.06.007