Plasma and EV Levels of IL-6, IL-10 and TNFα were measured using an ultrasensitive assay (Neurology 3-Plex A, item 101995, Quanterix Corporation, Lexington, MA) and single-molecule technology (SIMOA™) on a HD-1 analyzer (Quanterix Corporation) and reported in pg/mL. Samples were randomized over plates and tested in duplicate with laboratory scientists blinded to participant groups. All samples underwent quality control analysis and samples with reported coefficients of variation over 20% were not used for analysis. Samples with high coefficients of variation and concentrations below lower limits of quantification were replaced by values equal to half of the limit of concentration respective to the assay.
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