UK multicentre project on assessment of risk of trisomy 21 by maternal age and fetal nuchal-translucency thickness at 10-14 weeks of gestation
Snijders RJM, Noble P, Sebire N, Souka A, Nicolaides KH. UK multicentre project on assessment of risk of trisomy 21 by maternal age and fetal nuchal-translucency thickness at 10-14 weeks of gestation. Lancer 1998; 352: 343-346.
First trimester urine free beta hCG. beta core and total oestriol in pregnancies affected by Down’s syndrome: Implications for first-trimester screening with nuchal translucency and serum free beta hCG
Spencer K, Noble P, Snijders RJM, Nicolaides KH. First trimester urine free beta hCG. beta core and total oestriol in pregnancies affected by Down’s syndrome: implications for first-trimester screening with nuchal translucency and serum free beta hCG. Prenat Diagn 1997; 17: 525-538.