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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. -
Frontomaxillary and mandibulomaxillary facial angles at 11 + 0 to 13 + 6 weeks in fetuses with trisomy 18.
Borenstein M, Persico N, Strobl I, Sonek J, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:928-33.