Rodríguez-Esparragón F, Hernández-Perera O, Rodríguez-Pérez JC, Anábitarte A, Díaz-Cremades JM, Losada A, Fiuza D, Hernández E, Yunis C, Ferrario CM. The effect of methylenetetrahydrofolate reductase C677T common variant on hypertensive risk is not solely explained by increased plasma homocysteine values. Clin Exp Hypertens. 2003 May; 25(4):209-20.