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Flowchart of the study population. PD, Parkinson’s disease; PDD, Parkinson’s disease dementia; PD-NC, PD—normal cognition; PD-FS, PD—frontostriatal subtype; PD-PC, PD—posterior cortical subtype; PD-MS, PD—mixed subtype; 3DT1, 3-dimensional T1-weighted; CTh, cortical thickness; MRI, magnetic resonance imaging; DTI, diffusion tensor imaging.
