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The prevalence of REM sleep behavior disorder (RBD) has been estimated to be around 0.5 % in the general population, while in patients with Parkinson’s disease the frequency ranges between 40 and 46 %. Current criteria for the diagnosis of RBD do not specify a clear quantitative cut-off for muscle activity, that is, how much EMG activity during REM sleep is normal, and at what point does it become...
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