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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 -
First trimester maternal serum free ß-human chorionic gonadotropin and pregnancy-associated plasma protein A in pregnancies complicated by diabetes mellitus.
Savvidou M, Syngelaki A, Muhaisen M, Emelyanenko E, Nicolaides KH.
BJOG 2012;119:410-6.