-
Second-trimester uterine artery Doppler screening in unselected populations: a review.
Papageorghiou AT, Yu CK, Cicero S, Bower S, Nicolaides KH.
J Matern Fetal Neonatal Med 2002;12:78-88. -
The prevalence of non-viable pregnancy at 10-13 weeks of gestation.
Pandya PP, Snijders RJ, Psara N, Hilbert L, Nicolaides KH.
Ultrasound Obstet Gynecol 1996;7:170-3.