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Physiological distribution of placental growth factor and soluble Flt-1 in early pregnancy.
Makrydimas G, Sotiriadis A, Savvidou MD, Spencer K, Nicolaides KH.
Prenat Diagn 2008;28:175-9. -
Prediction of pregnancy complications by first-trimester maternal serum PAPP-A and free beta-hCG and with second-trimester uterine artery Doppler.
Spencer K, Yu CK, Cowans NJ, Otigbah C, Nicolaides KH.
Prenat Diagn 2005;25:949-53.