DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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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 (04) 231-237 . Doi: 10.1046/j.1469-0705.1999.13040231.x
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