Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions. References , , , , , and . 2017. “Sphenofrontal Distance in Euploid and Aneuploid Fetuses.” Ultrasound in Obstetrics & Gynecology 50, no. 2: 187–191. , , , et al. 1995.