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Maternal racial origin and adverse pregnancy outcome: a cohort study.
Khalil A, Rezende J, Akolekar R, Syngelaki A, Nicolaides KH.
Ultrasound Obstet Gynecol 2013;41:278-85. -
Prediction of pregnancy complications by first-trimester maternal serum PAPP-A and free beta-hCG and with second-trimester uterine artery Doppler.
Spencer K, Yu CK, Cowans NJ, Otigbah C, Nicolaides KH.
Prenat Diagn 2005;25:949-53.