Chinese Journal of Perinatal Medicine, Volume 16, Issue 4,2013, Pages 197-199, doi:10.3760/cma.j.issn.1007-9408.2013.04.003
Chinese Journal of Perinatal Medicine, Volume 16, Issue 4,2013, Pages 222-226, doi:10.3760/cma.j.issn.1007-9408.2013.04.008
Chinese Journal of Perinatal Medicine, Volume 16, Issue 4,2013, Pages 216-221, doi:10.3760/cma.j.issn.1007-9408.2013.04.007
Chinese Journal of Perinatal Medicine, Volume 16, Issue 4,2013, Pages 238-240, doi:10.3760/cma.j.issn.1007-9408.2013.04.011
Chinese Journal of Perinatal Medicine, Volume 16, Issue 4,2013, Pages 200-205, doi:10.3760/cma.j.issn.1007-9408.2013.04.004