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Nasal bone length in euploid fetuses at 16-24 weeks of gestation by three-dimensional ultrasound.
Persico N, Molina F, Borenstein M, Azumendi G, Nicolaides KH.
Ultrasound Obstet Gynecol 2010;36:285-90. -
Nasal bone assessment in prenatal screening for trisomy 21.
Sonek JD, Cicero S, Neiger R, Nicolaides KH.
Am J Obstet Gynecol 2006;195:1219-30.