Role of uterine artery Doppler in interpreting low PAPP-A values in first-trimester screening for Down syndrome in pregnancies at high risk of impaired placentation

1. Herraiz, I.
2. López-Jiménez, E.A.
3. García-Burguillo, A.
4. Nieto, O.
5. Villar, O.P.
6. Escribano, D.
7. Galindo, A.