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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 -
Maternal serum visfatin at 11-13 weeks' gestation in preeclampsia.
Ferreira AF, Rezende JC, de Cassia C Oliveira R, Akolekar R, Nicolaides KH.
J Hum Hypertens 2013;27:261-4.