TF and Parkinson disease: Movement Disorders Society—Unified Parkinson’s Disease Rating Scale (MDS-UPDRS) T2* MRI (surrogate measure for iron) Serum iron, ferritin, transferrin and ceruloplasmin CSF iron and ferritin Plasma and CSF oxidative stress markers including malonaldehyde, 8-oxo-7,8-dihydro-2′-deoxyguanosine and carbonylated proteins Plasma and CSF antioxidant markers including glutathione peroxidase and superoxide dismutase