TNF and Parkinson disease: A recent meta‐analysis reports increased interleukin (IL)‐1β, tumor necrosis factor‐α (TNF‐α), IL‐6, and IL‐10 in the blood of patients with PD, whereas in CSF, IL‐1β, IL‐6, transforming growth factor (TGF)‐β1, and C‐reactive protein (CRP) are elevated.11