Serrano NC, Casas JP, Díaz LA, Páez C, Mesa CM, Cifuentes R, Monterrosa A, Bautista A, Hawe E, Hingorani AD, Vallance P, López-Jaramillo P. Endothelial NO synthase genotype and risk of preeclampsia: a multicenter case-control study. J Clin Hypertens (Greenwich). 2004;44(5):702-7.