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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. -
Maternal serum vitamin D at 11-13 weeks in pregnancies delivering small for gestational age neonates.
Ertl R, Yu CK, Samaha R, Akolekar R, Nicolaides KH.
Fetal Diagn Ther 2012;31:103-8.