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Prediction of pregnancy complications by first-trimester maternal serum PAPP-A and free beta-hCG and with second-trimester uterine artery Doppler.
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Prenat Diagn 2005;25:949-53. -
First trimester maternal serum AFP and total hCG in aneuploidies other than trisomy 21.
Spencer K, Heath V, Flack N, Ong C, Nicolaides KH.
Prenat Diagn 2000;20:635-9. -
Early prenatal diagnosis of triploidy.
Jauniaux E, Brown R, Snijders RJ, Noble P, Nicolaides KH.
Am J Obstet Gynecol 1997;176:550-4.