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Prevalence of fetal facial cleft at different stages of pregnancy.
Snijders RJ, Sebire NJ, Psara N, Souka A, Nicolaides KH.
Ultrasound Obstet Gynecol 1995;6:327-9. -
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.