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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. -
Nasal bone in first-trimester screening for trisomy 21.
Cicero S, Avgidou K, Rembouskos G, Kagan KO, Nicolaides KH.
Am J Obstet Gynecol 2006;195:109-14. -
The 11-14 week scan.
Nicolaides KH, Heath V, Liao AW.
Baillieres Best Pract Res Clin Obstet Gynaecol 2000;14:581-94.