References
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- Nicolaides KH. Nuchal translucency and other first-trimester sonographic markers of chromosomal abnormalities. Am J Obstet Gynecol 2004;191:45-67. (Review article)
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- Cicero S, Ciarcio P, Papageorghiore A, et al. Absence of nasal bone in fetuses with trisomy 21 at 11-14 weeks gestation: an observational study. Lancet 2001;358:1165-7. (Level II evidence). Click here to view reference
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