Variants and haplotypes of the angiotensinogen gene are associated with hypertension in the Caerphilly Prospective Study od Xue, M, Wallace, C, Dobson, R, Garcia, E, Kazeem, G, Gardener, G, Needham, E, Mattu, R, Ben-Shlomo, Y, Yarnell, J, Sweetnam, P, Farrall, M, Caulfield, M, Munroe, P