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Figure 4 Correlation between treatment-induced change in collateral flow index ( ${Delta}$ CFI, vertical axis) and the respective change in tumor necrosis factor-alpha concentration ( ${Delta}$ TNF-alpha, horizontal axis), i.e., the only independent predictor among 11 factors (see text) of ${Delta}$ CFI. Black symbols indicate values obtained in stenotic, blue symbols in normal vessels, respectively. *Value after treatment minus value before treatment.