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Clinical and cognitive progression in PD with predominant dopaminergic putaminal deficit on the left (PD‐left) versus the right side (PD‐right), namely in the (A) MDS‐UPDRS III, (B) LEDD, (C) CSF β‐amyloid, and (D) SDMT. Aβ42, β‐amyloid; CSF, cerebrospinal fluid; LEDD, levodopa equivalent daily dose; MDS‐UPDRS III, Movement Disorder Society Unified Parkinson's Disease Rating Scale motor score; PD, Parkinson's disease; SDMT, Symbol Digit Modalities Test.
