The back cover image is based on the Research Letter Monozygosity by cell‐free DNA screening in a dichorionic twin pregnancy with discordant fetal sex: Informed antenatal and postnatal care by Richard P. Porreco et al., https://doi.org/10.1002/pd.5640.

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封面图片

封底图片基于在胎儿性别不一致的绒毛双胎妊娠中通过无细胞DNA筛选获得的研究信单合性： Richard P. Porreco等人的知情产前和产后护理，https：//doi.org/10.1002 /pd.5640。