Chinese Journal of Perinatal Medicine, Volume 16, Issue 6,2013, Pages 371-373, doi:10.3760/cma.j.issn.1007-9408.2013.06.012
Chinese Journal of Perinatal Medicine, Volume 16, Issue 6,2013, Pages 357-361, doi:10.3760/cma.j.issn.1007-9408.2013.06.009
Chinese Journal of Perinatal Medicine, Volume 16, Issue 6,2013, Pages 362-368, doi:10.3760/cma.j.issn.1007-9408.2013.06.010
Chinese Journal of Perinatal Medicine, Volume 16, Issue 6,2013, Pages 369-371, doi:10.3760/cma.j.issn.1007-9408.2013.06.011
Chinese Journal of Perinatal Medicine, Volume 16, Issue 6,2013, Pages 321-323, doi:10.3760/cma.j.issn.1007-9408.2013.06.001