Methylenetetrahydrofolate reductase (MTHFR) 677C > T and methionine synthase reductase (MTRR) 66A > G polymorphisms: association with serum homocysteine and angiographic coronary artery disease in the era of flour products fortified with folic acid - Brilakis,E.S.; Berger,P.B.; Ballman,K.V.; Rozen,R. (Atherosclerosis, 2003)