Performance evaluation of biochemical and ultrasound markers for the screening of chromosomal numerical abnormalities in the first trimester of pregnancy

1. Martínez-Ruiz, A.
2. Vílchez, J.A.
3. Sarabia-Meseguer, M.D.
4. López-Expósito, I.
5. Cañizares-Hernández, F.
6. Martínez-Hernández, P.
7. Tovar-Zapata, I.