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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 -
Increased fetal erythroblasts in women who subsequently develop pre-eclampsia.
Al-Mufti R, Hambley H, Albaiges G, Lees C, Nicolaides KH.
Hum Reprod 2000;15:1624-8.