Maheshwari A, Norby FL, Soliman EZ, Koene R, Rooney M, O'Neal WT, Alonso A, Chen LY. Refining Prediction of Atrial Fibrillation Risk in the General Population With Analysis of P-Wave Axis (from the Atherosclerosis Risk in Communities Study). Am J Cardiol. 2017 Dec 01; 120(11):1980-1984.