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Replacing the combined test by cell-free DNA testing in screening for trisomies 21, 18 and 13: impact on the diagnosis of other chromosomal abnormalities.
Syngelaki A, Pergament E, Homfray T, Akolekar R, Nicolaides KH.
Fetal Diagn Ther 2014;35:174-84. pdf -
Some thoughts on the true value of ultrasound.
Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:671-4.