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Screening at 11-13+6 weeks' gestation.
Sonek JD, Nicolaides KH, Janku P.
Ceska Gynekol 2012;77:92-104. -
Prediction of early, intermediate and late pre-eclampsia from maternal factors, biophysical and biochemical markers at 11-13 weeks.
Akolekar R, Syngelaki A, Sarquis R, Zvanca M, Nicolaides KH.
Prenat Diagn 2011;31:66-74.