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Processing speed scores were plotted versus the whole‐brain average FA (left) and R WM/GM perfusion ratio (right) for cerebral WM. Processing speed scores were significantly correlated with FA values (r = 0.35, P = 0.02 and r = 0.36, P = 0.005, in patients/controls, respectively) and with the R WM/GM ratios (r = 0.44, P = 4.5 × 10−3 and r = 0.41, P = 1.1 × 10−3, in patients/controls, respectively).
