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A model for a new pyramid of prenatal care based on the 11 to 13 weeks' assessment.
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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.