Chinese Journal of Perinatal Medicine, Volume 15, Issue 8,2012, Pages 494-499, doi:10.3760/cma.j.issn.1007-9408.2012.08.013
Chinese Journal of Perinatal Medicine, Volume 15, Issue 8,2012, Pages 481-482, doi:10.3760/cma.j.issn.1007-9408.2012.08.010
Chinese Journal of Perinatal Medicine, Volume 15, Issue 8,2012, Pages 462-468, doi:10.3760/cma.j.issn.1007-9408.2012.08.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 8,2012, Pages 483-489, doi:10.3760/cma.j.issn.1007-9408.2012.08.011
Chinese Journal of Perinatal Medicine, Volume 15, Issue 8,2012, Pages 452-454, doi:10.3760/cma.j.issn.1007-9408.2012.08.002