Chinese Journal of Perinatal Medicine, Volume 18, Issue 1,2015, Pages 64-66, doi:10.3760/cma.j.issn.1007-9408.2015.01.017
Chinese Journal of Perinatal Medicine, Volume 18, Issue 1,2015, Pages 24-29, doi:10.3760/cma.j.issn.1007-9408.2015.01.006
Chinese Journal of Perinatal Medicine, Volume 18, Issue 1,2015, Pages 67-69, doi:10.3760/cma.j.issn.1007-9408.2015.01.018
Chinese Journal of Perinatal Medicine, Volume 18, Issue 1,2015, Pages 57-60, doi:10.3760/cma.j.issn.1007-9408.2015.01.015