Chinese Journal of Perinatal Medicine, Volume 22, Issue 2,2019, Pages 89-92, doi:10.3760/cma.j.issn.1007-9408.2019.02.004
Chinese Journal of Perinatal Medicine, Volume 22, Issue 2,2019, Pages 73-78, doi:10.3760/cma.j.issn.1007-9408.2019.02.001
Chinese Journal of Perinatal Medicine, Volume 22, Issue 2,2019, Pages 106-112, doi:10.3760/cma.j.issn.1007-9408.2019.02.007
Chinese Journal of Perinatal Medicine, Volume 22, Issue 2,2019, Pages 137-138, doi:10.3760/cma.j.issn.1007-9408.2019.02.013
Chinese Journal of Perinatal Medicine, Volume 22, Issue 2,2019, Pages 123-126, doi:10.3760/cma.j.issn.1007-9408.2019.02.010