Chinese Journal of Perinatal Medicine, Volume 15, Issue 6,2012, Pages 379-381, doi:10.3760/cma.j.issn.1007-9408.2012.06.018
Chinese Journal of Perinatal Medicine, Volume 15, Issue 6,2012, Pages 375-378, doi:10.3760/cma.j.issn.1007-9408.2012.06.017
Chinese Journal of Perinatal Medicine, Volume 15, Issue 6,2012, Pages 349-352, doi:10.3760/cma.j.issn.1007-9408.2012.06.008
Chinese Journal of Perinatal Medicine, Volume 15, Issue 6,2012, Pages 358-362, doi:10.3760/cma.j.issn.1007-9408.2012.06.011
Chinese Journal of Perinatal Medicine, Volume 15, Issue 6,2012, Pages 372-374, doi:10.3760/cma.j.issn.1007-9408.2012.06.016