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Sphenofrontal distance on three-dimensional ultrasound in euploid and trisomy-21 fetuses at 16-24 weeks' gestation.
Cossellu G, Persico N, D'Ambrosi F, Carbone F, Fabietti I, Boito S, Farronato G, Fedele L, Nicolaides KH.
Ultrasound Obstet Gynecol 2016;48:177-80. pdf