Chinese Journal of Perinatal Medicine, Volume 15, Issue 11,2012, Pages 656-659, doi:10.3760/cma.j.issn.1007-9408.2012.11.006
Chinese Journal of Perinatal Medicine, Volume 15, Issue 11,2012, Pages 651-655, doi:10.3760/cma.j.issn.1007-9408.2012.11.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 11,2012, Pages 704-705, doi:10.3760/cma.j.issn.1007-9408.2012.11.016
Chinese Journal of Perinatal Medicine, Volume 15, Issue 11,2012, Pages 641-643, doi:10.3760/cma.j.issn.1007-9408.2012.11.001
Chinese Journal of Perinatal Medicine, Volume 15, Issue 11,2012, Pages 683-688, doi:10.3760/cma.j.issn.1007-9408.2012.11.011