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Prefrontal space ratio: comparison between trisomy 21 and euploid fetuses in the second trimester.
Sonek J, Molina F, Hiett AK, Glover M, McKenna D, Nicolaides KH.
Ultrasound Obstet Gynecol 2012;40:293-6. -
Some thoughts on the true value of ultrasound.
Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:671-4.