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Serum alpha-fetoprotein in the three trimesters of pregnancy: effects of maternal characteristics and medical history.
Bredaki FE, Sciorio C, Wright A, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2015;46:34-41. pdf -
First trimester maternal serum alpha-fetoprotein in fetal trisomies.
Brizot ML, Khun P, Bersinger NA, Snijders RJM, Nicolaides KH.
Br J Obstet Gynaecol 1995;102:31-4.