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Adrenal gland length in euploid and trisomy 18 fetuses at 11-13 weeks.
Gielchinsky Y, Zvanca M, Akolekar R, Calvo JR, Nicolaides KH.
Prenat Diagn 2011;31:773-7. -
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.