Chinese Journal of Perinatal Medicine, Volume 16, Issue 12,2013, Pages 709-711, doi:10.3760/cma.j.issn.1007-9408.2013.12.002
Chinese Journal of Perinatal Medicine, Volume 16, Issue 12,2013, Pages 705-708, doi:10.3760/cma.j.issn.1007-9408.2013.12.001
Chinese Journal of Perinatal Medicine, Volume 16, Issue 12,2013, Pages 736-740, doi:10.3760/cma.j.issn.1007-9408.2013.12.009
Chinese Journal of Perinatal Medicine, Volume 16, Issue 12,2013, Pages 747-749, doi:10.3760/cma.j.issn.1007-9408.2013.12.012