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Fetal fraction of cell-free DNA in maternal plasma in the prediction of spontaneous preterm delivery.
Quezada MS, Francisco C, Dumitrascu-Biris D, Nicolaides KH, Poon LC.
Ultrasound Obstet Gynecol 2015;45:101-5. pdf -
Maternal plasma cell-free fetal and maternal DNA at 11-13 weeks' gestation: relation to fetal and maternal characteristics and pregnancy outcomes.
Poon LC, Musci T, Song K, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2013;33:215-23. pdf