DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Spencer K, Souter V, Tul N, Snijders R, Nicolaides KH.
A screening program for trisomy 21 at 10 - 14 weeks using fetal nuchal translucency, maternal serum free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Ultrasound Obstet Gynecol 1999; 13: 231-237
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