In the analysis of 16,769 community-dwelling individuals without atrial fibrillation, there was a step-wise increase in the risk of incident atrial fibrillation with decreasing kidney function.

, , Increasing or Decreasing Returns to Scale in the Constant Elasticity of Substitution Production Function, The Review of Economics and Statistics, Vol. 51, No. 1 (Feb., 1969), pp. 84-90 ...