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Assessment of the gap between the fetal nasal bones at 11 to 13 + 6 weeks of gestation by three-dimensional ultrasound.
Peralta CF, Falcon O, Wegrzyn P, Faro C, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;25:464-7. -
Fetal head-to-trunk volume ratio in chromosomally abnormal fetuses at 11 + 0 to 13 + 6 weeks of gestation.
Falcon O, Cavoretto P, Peralta CF, Csapo B, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;26:755-60. -
Maternal serum biochemistry at 11-13(+6) weeks in relation to the presence or absence of the fetal nasal bone on ultrasonography in chromosomally abnormal fetuses: an updated analysis of integrated ultrasound and biochemical screening.
Cicero S, Spencer K, Avgidou K, Faiola S, Nicolaides KH.
Prenat Diagn 2005;25:977-83.