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Significant correlation between relative putamen volume and participant’s age. Nearly every patient with relapsing-remitting multiple sclerosis (RRMS) (67/68) showed a lower RPV for a given age (=negative ΔRPV, see arrow), as expected from the relationship between RPV and age of healthy controls. The blue line represents the function RPVHC(Age) = 0.916 − 0.0038 × Age (Equation (1)).
