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Maternal age and adverse pregnancy outcomes: a cohort study.
Khalil A, Syngelaki A, Maiz N, Zinevich Y, Nicolaides KH.
Ultrasound Obstet Gynecol 2013;42:634-43. pdf -
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. -
First-trimester maternal serum PAPP-A, SP1 and M-CSF levels in normal and trisomic twin pregnancies.
Bersinger NA, Noble P, Nicolaides KH.
Prenat Diagn 2003;23:157-62.