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First trimester Angiotensinogen: Kallikrein ratio is raised in women who develop severe early-onset pre-eclampsia.
Breslin E, Slade S, Akolekar R, Nicolaides KH, Scrivens J, Quenby S.
Arch Dis Child Fetal Neonatal Ed 2014;99 Suppl 1:A5. pdf -
Maternal plasma pentraxin 3 at 11 to 13 weeks of gestation in hypertensive disorders of pregnancy.
Akolekar R, Casagrandi D, Livanos P, Tetteh A, Nicolaides KH.
Prenat Diagn 2009;29:934-8.