-
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 -
Comparison of two different sites of measurement for transabdominal uterine artery Doppler velocimetry at 11-13 weeks.
Lefebvre J, Demers S, Bujold E, Nicolaides KH, Girard M, Brassard N, Audibert F.
Ultrasound Obstet Gynecol 2012;40:288-92.