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Results of the voxel-wise comparisons of mean diffusivity (MD; gmMD, nMD, pMD) between the Alzheimer's disease (AD) and mild cognitive impairment (MCI) groups (a) and between the AD and cognitive normal (CN) groups (b) using one-way ANOVA tests. There were no decreased MD values for all three maps of gmMD, pMD, and nMD in the patients with AD as compared with that of the MCI or CN patients. There were no significant differences between the MCI and CN patients
