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Prediction of spontaneous preterm delivery from maternal factors, obstetric history and placental perfusion and function at 11-13 weeks.
Beta J, Akolekar R, Ventura W, Syngelaki A, Nicolaides KH.
Prenat Diagn 2011;31:75-83. -
Maternal serum activin A and inhibin A in trisomy 18 pregnancies at 10-14 weeks.
Spencer K, Liao AW, Ong CY, Flack NJ, Nicolaides KH.
Prenat Diagn 2001;21:571-4.