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Routine first-trimester screening for fetal trisomies in twin pregnancy: cell-free DNA test contingent on results from combined test.
Galeva S, Konstantinidou L, Gil MM, Akolekar R, Nicolaides KH.
Ultrasound Obstet Gynecol 2019;53:208-213. pdf -
Cell-free DNA analysis for trisomy risk assessment in first-trimester twin pregnancies.
Gil MM, Quezada MS, Bregant B, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2014;35:204-11. pdf