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Cerebral ventricular system in fetuses with open spina bifida at 11-13 weeks' gestation.
Loureiro T, Ushakov F, Montenegro N, Gielchinsky Y, Nicolaides KH.
Ultrasound Obstet Gynecol 2012;39:620-4. -
First-trimester screening for neural tube defects using alpha-fetoprotein.
Bredaki FE, Poon LC, Birdir C, Escalante D, Nicolaides KH.
Fetal Diagn Ther 2012;31:109-14.