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Receiver operating characteristic (ROC) curves for the predictive performance of DLK1 alone (— — —, red), ultrasound data (fetal head circumference, fetal abdominal circumference, femur length, and gestational age at measurement) alone (— - —, green), and DLK1 and ultrasound data combined (——−, blue). (N = 180 cases, 340 controls).
