Linkage disequilibrium at PPARG and other genes assessed with dense sets of SNPs.. by Hirschhorn, J, Altshuler, D, Daly, M, Lindgren, C, Burtt, N, Loomer, M, Villapakkam, A, Bolk, S, O'Donnell, C, Crews, J, Groop, L, Lander, E