Objective: To determine if blood neurofilament light chain (NfL) protein can discriminate between Parkinson disease (PD) and atypical Parkinsonian disorders (APD) with equally high diagnostic accuracy as CSF NfL, and can therefore improve the diagnostic workup of parkinsonian disorders.
Methods: The study included 3 independent prospective cohorts: the Lund (n = 278) and London (n = 117) cohorts,
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