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Urinary beta-core hCG: screening for aneuploidies in early pregnancy (11-14 weeks gestation)
Macintosh MC, Nicolaides KH, Noble P, Chard T, Gunn L, Illes R.
Prenat Diagn 1997;17:401-5. -
Abnormalities of the heart and great arteries in first trimester chromosomally abnormal fetuses.
Hyett J, Moscoso G, Nicolaides KH.
Am J Med Genet 1997;69:207-16.