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Screening for trisomy 18 by maternal age, fetal nuchal translucency, free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Kagan KO, Wright D, Maiz N, Pandeva I, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;32:488-92. -
Frontomaxillary and mandibulomaxillary facial angles at 11 + 0 to 13 + 6 weeks in fetuses with trisomy 18.
Borenstein M, Persico N, Strobl I, Sonek J, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:928-33. -
Frontomaxillary facial angle in fetuses with trisomy 13 at 11 + 0 to 13 + 6 weeks.
Borenstein M, Persico N, Dagklis T, Faros E, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:819-23.