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...The course of parkinson s disease journey l n i e h c t w o a r g b progression pd pathology occurs on number levels within cell between nearby cells and then over longer distances throughout brain adapted from mccann et al mov disord clinical symptoms time motor non falls dementia d postural instability gait disorder p psychotic dysphagia hallucinations delusions axial deformities dyskinesias orthostatic hypotension urinary fluctuations m apathy fatigue bradykinesia rigidity y tremor excessive daytime sleepiness mild cognitive impairment anxiety pain constipation hyposmia depression rem sleep behaviour rapid eye movement poewe nat rev dis primers kulisevsky neurologia thresholds for appearance ascending pathological process x stages u stage braak years pre symptomatic phase is marked by lewy in brains asymptomatic individuals individual neuropathological threshold exceeded leading to tissue res therapeutic benefits modifying modification there an unmet need therapies schapira which mo...