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Prospective validation of first-trimester combined screening for trisomy 21.
Kagan KO, Etchegaray A, Zhou Y, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2009;34:14-8. -
Effect of deviation of nuchal translucency measurements on the performance of screening for trisomy 21.
Kagan KO, Wright D, Etchegaray A, Zhou Y, Nicolaides KH.
Ultrasound Obstet Gynecol 2009;33:657-64.