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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 -
Longitudinal changes in maternal soluble endoglin and angiopoietin-2 in women at risk of preeclampsia.
Khalil A, Maiz N, Garcia-Mandujano R, ElKhouli M, Nicolaides KH.
Ultrasound Obstet Gynecol 2014;44:402-10. pdf