- 
    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.
- 
    Maternal serum visfatin at 11-13 Weeks of gestation in gestational diabetes mellitus.
 Ferreira AF, Rezende JC, Vaikousi E, Akolekar R, Nicolaides KH.
 Clin Chem 2011;57:609-13.
