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Screening for trisomy at 11-13 weeks' gestation: use of pregnancy-associated plasma protein-A, placental growth factor or both.
Mazer Zumaeta A, Wright A, Syngelaki A, Maritsa VA, Bardani E, Nicolaides KH.
Ultrasound Obstet Gynecol 2020;56:408-415. pdf -
A model for a new pyramid of prenatal care based on the 11 to 13 weeks' assessment.
Nicolaides KH.
Prenat Diagn 2011;31:3-6. -
Turning the pyramid of prenatal care.
Nicolaides KH.
Fetal Diagn Ther 2011;29:183-96.