Kestenbaum B, Rudser KD, Shlipak MG, Fried LF, Newman AB, Katz R, Sarnak MJ, Seliger S, Stehman-Breen C, Prineas R, et al. Kidney function, electrocardiographic findings, and cardiovascular events among older adults. Clin J Am Soc Nephrol. 2007  ;2(3):501-8.