A candidate genetic risk factor for cardiovascular disease: a common mutation in methylenetetrahydrofolate reductase. - Frosst, P; Blom, HJ; Milos, R; Goyette, J; Sheppard, CA; Matthews, RG; Boers, GJH; den Heizer, M; Kluigturaus, LAJ; van den Hervel, LP; Rosen, R (Nature Genet, 1995)