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Prefrontal space ratio: comparison between trisomy 21 and euploid fetuses in the second trimester.
Sonek J, Molina F, Hiett AK, Glover M, McKenna D, Nicolaides KH.
Ultrasound Obstet Gynecol 2012;40:293-6. -
Liver volume in trisomy 21 and euploid fetuses at 11 to 13 weeks.
Gielchinsky Y, Zvanca M, Minekawa R, Persico N, Nicolaides KH.
Prenat Diagn 2011;31:28-32.