CBS and Parkinson disease: The meta‐analysis revealed that nEVs α‐syn is higher only in PD and DLB versus PSP (k = 6, SMD = 1.04; 95% CI 0.39, 1.69; p = 0.0017; Figure 6A) and CBS (k = 6, SMD = 0.87; 95% CI 0.27, 1.47; p = 0.0020; Figure 6B).