For example, Michels et al. [43] reviewed evidence for CRP, IL-6, IL-8, and cortisol as potential predictors of delirium in acutely ill patients, while Bassi et al. [44] conducted a meta-analysis demonstrating significant associations between delirium and elevated IL-6, CRP, S100β, and cortisol at hospital admission [43, 44]. This evidence concerns the gene IL6 and delirium.