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Frontomaxillary facial angle in fetuses with trisomy 13 at 11 + 0 to 13 + 6 weeks.
Borenstein M, Persico N, Dagklis T, Faros E, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:819-23. -
Sonographic screening for trisomy 13 at 11 to 13(+6) weeks of gestation.
Papageorghiou AT, Avgidou K, Spencer K, Nix B, Nicolaides KH.
Am J Obstet Gynecol 2006;194:397-401.