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Exhaled nitric oxide concentration and amniotic fluid nitrite concentration during pregnancy.
Morris-NH, Carroll S, Nicolaides KH, Steer PJ, Warren JB.
Eur J Clin Invest 1995;25:138-41. -
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.