Self-reported health, neuropsychological tests and biomarkers in fully recovered COVID-19 patients vs patients with post-COVID cognitive symptoms https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0315486 Long COVID Brain Fog “Very Well Explained” By Altered Levels Of 2 Key Biomarkers https://www.iflscience.com/long-covid-brain-fog-very-well-explained-by-altered-levels-of-2-key-biomarkers-79218