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Maxillary length at 11-14 weeks of gestation in fetuses with trisomy 21.
Cicero S, Curcio P, Rembouskos G, Sonek J, Nicolaides KH.
Ultrasound Obstet Gynecol 2004;24:19-22. -
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.