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Second-trimester screening for trisomy-21 using prefrontal space ratio.
Chaveeva P, Agathokleous M, Poon LC, Markova D, Nicolaides KH.
Fetal Diagn Ther 2013;34:50-5. pdf -
Frontomaxillary facial angle in trisomy 21 fetuses at 16-24 weeks of gestation.
Molina F, Persico N, Borenstein M, Sonek J, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;31:384-7. -
Frontomaxillary facial angles in screening for trisomy 21 at 14-23 weeks gestation.
Sonek J, Borenstein M, Downing C, McKenna D, Neiger R, Croom C, Genrich T, Nicolaides KH.
Am J Obstet Gynecol 2007;197:160.