Chinese Journal of Perinatal Medicine, Volume 20, Issue 6,2017, Pages 427-432, doi:10.3760/cma.j.issn.1007-9408.2017.06.005
Chinese Journal of Perinatal Medicine, Volume 20, Issue 6,2017, Pages 464-467, doi:10.3760/cma.j.issn.1007-9408.2017.06.014
Chinese Journal of Perinatal Medicine, Volume 20, Issue 6,2017, Pages 454-457, doi:10.3760/cma.j.issn.1007-9408.2017.06.012
Chinese Journal of Perinatal Medicine, Volume 20, Issue 6,2017, Pages 444-447, doi:10.3760/cma.j.issn.1007-9408.2017.06.008