“…The full texts of the remaining 47 studies were reviewed, and 26 studies were subsequently excluded based on the eligibility criteria. Among the excluded studies, 15 did not report outcomes of interest (NfL and GFAP) in both COVID-19 and healthy controls [30,31,[38][39][40][41][42][43][44][45][46][47][48][49][50], six did not include healthy controls [31,36,38,44,48,51], three were reviews [8,52,53], and two were editorial reports [54,55]; note that a few reports belonged to more than one category. Finally, 21 studies that reported mean (±SD) or median (±IQR) values for NfL and GFAP were included in the meta-analysis (Figure 1).…”