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Title
Screening for trisomy 18 by maternal age, fetal nuchal translucency, free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Authors
Kagan KO; Wright D; Maiz N; Pandeva I; Nicolaides KH
Publication
Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2008, Vol 32, Issue 4, p488