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Screening for fetal aneuploidies at 11 to 13 weeks.
Nicolaides KH.
Prenat Diagn 2011;31:7-15. -
Prediction of miscarriage and stillbirth at 11-13 weeks and the contribution of chorionic villus sampling.
Akolekar R, Bower S, Flack N, Bilardo CM, Nicolaides KH.
Prenat Diagn 2011;31:38-45.