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Chronic hypertension and adverse pregnancy outcomes: a cohort study.
Panaitescu AM, Syngelaki A, Prodan N, Akolekar R, Nicolaides KH.
Ultrasound Obstet Gynecol 2017;50:228-235. pdf -
Assessment of umbilical arterial and venous flow using color Doppler.
Lees C, Albaiges G, Deane C, Parra M, Nicolaides KH.
Ultrasound Obstet Gynecol 1999;14:250-5.