Chinese Journal of Perinatal Medicine, Volume 21, Issue 9,2018, Pages 618,643, doi:10.3760/cma.j.issn.1007-9408.2018.09.101
Chinese Journal of Perinatal Medicine, Volume 21, Issue 9,2018, Pages 626-631, doi:10.3760/cma.j.issn.1007-9408.2018.09.011
Chinese Journal of Perinatal Medicine, Volume 21, Issue 9,2018, Pages 592-598, doi:10.3760/cma.j.issn.1007-9408.2018.09.004
Chinese Journal of Perinatal Medicine, Volume 21, Issue 9,2018, Pages 615-618, doi:10.3760/cma.j.issn.1007-9408.2018.09.008
Chinese Journal of Perinatal Medicine, Volume 21, Issue 9,2018, Pages 610-614, doi:10.3760/cma.j.issn.1007-9408.2018.09.007