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Advanced maternal age and smoking: risk factors for admission to a neonatal intensive care unit.
Yuksel B, Greenough A, Dobson P, Nicolaides KH.
J Perinat Med 1996;24:397-403. -
Assessment of fetal compromise by Doppler ultrasound investigation of the fetal circulation: arterial, intracardiac and venous blood flow velocity studies.
Hecher K, Campbell S, Doyle P, Harrington K, Nicolaides KH.
Circulation 1995;91:129-38.