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Screening for trisomy 13 by fetal nuchal translucency and maternal serum free beta hCG and PAPP-A at 10-14 weeks of gestation.
Spencer K, Ong C, Skentou H, Liao AW, Nicolaides KH.
Prenat Diagn 2000;20:411-6. -
The 11-14 week scan.
Nicolaides KH, Heath V, Liao AW.
Baillieres Best Pract Res Clin Obstet Gynaecol 2000;14:581-94. -
Increased nuchal translucency in trisomy 13 fetuses at 10-14 weeks of gestation.
Snijders RJ, Sebire NJ, Nayar R, Souka A, Nicolaides KH.
Am J Med Genet 1999;86:205-7.