Humphries S, Ye S, Talmud PJ, Bara L, Wilhelmsen L, Tiret L. European Atherosclerosis Research Study: Genotype at the fibrinogen locus (G-455-A b-gene) is associated with differences in plasma fibrinogen levels in young men and women from different regions in Europe. Evidence for gender-genotype-environment interaction. Arterioscler Thromb Vasc Biol 1995; 15(1):96-104.