Chinese Journal of Perinatal Medicine, Volume 22, Issue 11,2019, Pages 812-816, doi:10.3760/cma.j.issn.1007-9408.2019.11.010
Chinese Journal of Perinatal Medicine, Volume 22, Issue 11,2019, Pages 787-792, doi:10.3760/cma.j.issn.1007-9408.2019.11.005
Chinese Journal of Perinatal Medicine, Volume 22, Issue 11,2019, Pages 828,