CRP and peripheral arterial disease: Current literature supports that the strongest positive associations between PAD and cytokines are found with IL-6 [9, 13, 15, 25, 26] and CRP [9, 11, 13, 15, 26, 27] although there is some evidence for IL-6SR [9], TNFαSRI/II [15, 28] and a number of cytokines we did not measure in our study [9, 13, 29].