-
Maternal serum inhibin-A and activin-A levels in the first trimester of pregnancies developing pre-eclampsia.
Spencer K, Cowans NJ, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;32:622-6. -
First-trimester maternal serum activin A in pre-eclampsia and fetal growth restriction.
Ong CY, Liao AW, Munim S, Spencer K, Nicolaides KH.
J Matern Fetal Neonatal Med 2004;15:176-80.