Authors:
Spencer, K
Souter, V
Tul, N
Snijders, R
Nicolaides, KH
Citation: K. Spencer 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, ULTRASOUN O, 13(4), 1999, pp. 231-237