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Metopic suture in fetuses with Apert syndrome at 22-27 weeks of gestation.
Faro C, Chaoui R, Wegrzyn P, Levaillant JM, Benoit B, Nicolaides KH.
Ultrasound Obstet Gynecol 2006;27:28-33. -
Second-trimester levels of pregnancy-associated plasma protein-A and free beta-hCG in pregnancies with trisomy 13.
Spencer K, Crossley JA, Aitken DA, Nicolaides KH.
Prenat Diagn 2005;25:358-61.