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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 -
First-trimester contingent screening for trisomies 21, 18 and 13 by biomarkers and maternal blood cell-free DNA testing.
Nicolaides KH, Syngelaki A, Poon LC, Gil M, Wright D.
Fetal Diagn Ther 2014;35:185-92. pdf