Chinese Journal of Perinatal Medicine, Volume 20, Issue 7,2017, Pages 538-541, doi:10.3760/cma.j.issn.1007-9408.2017.07.012
Chinese Journal of Perinatal Medicine, Volume 20, Issue 7,2017, Pages 515-518, doi:10.3760/cma.j.issn.1007-9408.2017.07.007
Chinese Journal of Perinatal Medicine, Volume 20, Issue 7,2017, Pages 519-520, doi:10.3760/cma.j.issn.1007-9408.2017.07.008
Chinese Journal of Perinatal Medicine, Volume 20, Issue 7,2017, Pages 501-506, doi:10.3760/cma.j.issn.1007-9408.2017.07.005
Chinese Journal of Perinatal Medicine, Volume 20, Issue 7,2017, Pages 484-488, doi:10.3760/cma.j.issn.1007-9408.2017.07.002