Methylentetrahydrofolate reductase (MTHFR) 677 C>T and methionine synthase reductase (MTRR) 66 A>G polymorphisms: association with serum homocysteine and angiographic coronary artery disease in the era of flour products fortified with folic acid. - Brilakis, ES; Berger, PB; Ballman, KV (Atherosclerosis, 2003)