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Maternal serum vitamin D levels at 11-13 weeks of gestation in preeclampsia.
Yu CK, Ertl R, Skyfta E, Akolekar R, Nicolaides KH.
Hum Hypertens 2013;27:115-8 . pdf -
First-trimester maternal serum a disintegrin and metalloprotease 12 (ADAM12) and adverse pregnancy outcome.
Poon LC, Chelemen T, Granvillano O, Pandeva I, Nicolaides KH.
Obstet Gynecol 2008;112:1082-90.