Chinese Journal of Perinatal Medicine, Volume 15, Issue 12,2012, Pages 727-731, doi:10.3760/cma.j.issn.1007-9408.2012.12.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 12,2012, Pages 743-749, doi:10.3760/cma.j.issn.1007-9408.2012.12.008
Chinese Journal of Perinatal Medicine, Volume 15, Issue 12,2012, Pages 720-726, doi:10.3760/cma.j.issn.1007-9408.2012.12.004
Chinese Journal of Perinatal Medicine, Volume 15, Issue 12,2012, Pages 760-766, doi:10.3760/cma.j.issn.1007-9408.2012.12.012
Chinese Journal of Perinatal Medicine, Volume 15, Issue 12,2012, Pages 750-752, doi:10.3760/cma.j.issn.1007-9408.2012.12.009