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APA Citation
Gonzalez, R., Aedo, S., Dezerega, V., & Sepulveda, W. (2013). frontonasal Fold Thickness–to–Nasal Bone Length Ratio as a Prenatal Sonographic Marker for Trisomy 21 in a Low‐Risk Population. Journal of ultrasound in medicine, 32, 795–800. http://access.bl.uk/ark:/81055/vdc_100044904955.0x000027