A candidate genetic risk factor for vascular disease: a common mutation in methylene tetrahydroflate reductase: isolation of cDNA, mapping and mutation identification - Frosst, P; Blom, H J; Milos, R; Goyette, P; Sheppard, C A; Mathews, R G; Boers, G HJ; den, Heijer M; Kluijtmans, L AJ; van, den Heuvel LP; Rozen, R (Nature Genetics, 1995)