Chinese Journal of Perinatal Medicine, Volume 15, Issue 4,2012, Pages 217-221, doi:10.3760/cma.j.issn.1007-9408.2012.04.007
Chinese Journal of Perinatal Medicine, Volume 15, Issue 4,2012, Pages 206-210, doi:10.3760/cma.j.issn.1007-9408.2012.04.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 4,2012, Pages 222-227, doi:10.3760/cma.j.issn.1007-9408.2012.04.008
Chinese Journal of Perinatal Medicine, Volume 15, Issue 4,2012, Pages 240-243, doi:10.3760/cma.j.issn.1007-9408.2012.04.012
Chinese Journal of Perinatal Medicine, Volume 15, Issue 4,2012, Pages 255, doi:10.3760/cma.j.issn.1007-9408.2012.04.018