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Flow diagram of the study. Abbreviations: PD, Parkinson's disease; HCs, healthy controls; UPDRS, Unified Parkinson's Disease Rating Scale; SS-12, Sniffin’ Sticks Screening 12 test; HAMA, Hamilton Anxiety Scale; HAMD, Hamilton Depression Scale; MMSE, Mini-Mental State Exam; MoCA, Montreal Cognitive Assessment; ALCT, acute levodopa challenge test.
