Chinese Journal of Perinatal Medicine, Volume 17, Issue 8,2014, Pages 508-511, doi:10.3760/cma.j.issn.1007-9408.2014.08.002
Chinese Journal of Perinatal Medicine, Volume 17, Issue 8,2014, Pages 521-526, doi:10.3760/cma.j.issn.1007-9408.2014.08.005
Chinese Journal of Perinatal Medicine, Volume 17, Issue 8,2014, Pages 553-558, doi:10.3760/cma.j.issn.1007-9408.2014.08.011
Chinese Journal of Perinatal Medicine, Volume 17, Issue 8,2014, Pages 512-515, doi:10.3760/cma.j.issn.1007-9408.2014.08.003
Chinese Journal of Perinatal Medicine, Volume 17, Issue 8,2014, Pages 559-562, doi:10.3760/cma.j.issn.1007-9408.2014.08.012