This study is a prospective study with a mean of 5-year follow-up interval, aims to monitor the progression of α-synucleinopathy neurodegeneration by the evolution of prodromal markers and development of clinical disorders in first-degree relatives (FDRs) of idiopathic REM Sleep Behavior Disorder (RBD) patients and healthy controls.
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Changes of the overall probability of prodromal Parkinson's disease in the FDRs of patients with RBD.
Timeframe: Baseline and 5 years