Chinese Journal of Perinatal Medicine, Volume 14, Issue 9,2011, Pages 545-549, doi:10.3760/cma.j.issn.1007-9408.2011.09.008
Chinese Journal of Perinatal Medicine, Volume 14, Issue 9,2011, Pages 515-518, doi:10.3760/cma.j.issn.1007-9408.2011.09.002
Chinese Journal of Perinatal Medicine, Volume 14, Issue 9,2011, Pages 571-573, doi:10.3760/cma.j.issn.1007-9408.2011.09.015
Chinese Journal of Perinatal Medicine, Volume 14, Issue 9,2011, Pages 519-522, doi:10.3760/cma.j.issn.1007-9408.2011.09.003
Chinese Journal of Perinatal Medicine, Volume 14, Issue 9,2011, Pages 574-576, doi:10.3760/cma.j.issn.1007-9408.2011.09.016