DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Spencer K, Souter V, Tul N. et al.
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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