Description of a method to detect Parkinson's disease or Parkinson's-like disease at an early stage (Prodromal Parkinson's Disease) where damage is still confined to the peripheral nervous system damage. Simultaneous collection of biological material to establish a biobank for use as prognostic biomarkers for the development of Parkinson's disease and other neurodegenerative diseases in which pathological alpha-synuclein deposits accumulate.
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Number of participants with REM sleep behavior disorder (RBD)
Timeframe: RBD-status is assessed at two time point: Baseline (at the time of enrollment) and 5-year follow-up