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Maternal serum human placental growth hormone at 11 to 13 weeks in trisomy 21 and trisomy 18 pregnancies.
Sifakis S, Akolekar R, Syngelaki A, Cruz JJ, Nicolaides KH.
Prenat Diagn 2010;30:212-5. -
Hypertensive disorders in pregnancy: screening by biophysical and biochemical markers at 11-13 weeks.
Poon LC, Akolekar R, Lachmann R, Beta J, Nicolaides KH.
Ultrasound Obstet Gynecol 2010;35:662-70.