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Upper panel t-maps of the voxel-wise GM comparisons respectively between HC and MSA (a) and PD and MSA (b). Statistical threshold is set to p < 0.05 after FWE correction for multiple comparison. Lower panel box-plots of the GM density distribution in the significant clusters (from the comparison HC vs MSA) for each group, and results of the post-hoc t-tests on the regional values (c). *p < 0.05, **p < 0.01, ***p < 0.001.
