Luminex kits for human neurodegenerative disease panel three (PDGF-AA and PDGF-AB/BB) were acquired from Millipore (cat. no. HNDG3MAG-36K) (Millipore Inc Billerica, MA, USA) and performed according to manufacturer instructions. Pre-treatment of serum samples and parameters in a FLEXMAP3D (Luminex, TX, USA) were similar to previous reports.18 (link) Median fluorescence intensity (MFI) was determined and used to estimate serum concentration of PDGF-AA and PDGF-AB/BB. Protein concentrations were calculated according to the standard curve using a known concentration.