Chinese Journal of Perinatal Medicine, Volume 22, Issue 4,2019, Pages 284-286, doi:10.3760/cma.j.issn.1007-9408.2019.04.014
Chinese Journal of Perinatal Medicine, Volume 22, Issue 4,2019, Pages 277,
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Chinese Journal of Perinatal Medicine, Volume 22, Issue 4,2019, Pages 255-260, doi:10.3760/cma.j.issn.1007-9408.2019.04.009