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Ear length in trisomy 21 fetuses at 11-14 weeks of gestation.
Sacchini C, El-Sheikhah A, Cicero S, Rembouskos G, Nicolaides KH.
Ultrasound Obstet Gynecol 2003;22:460-3. -
Sonographic markers of fetal aneuploidy: a review.
Cicero S, Sacchini C, Rembouskos G, Nicolaides KH.
Placenta 2003;24:S88-98.