S100B and delirium: A growing body of evidence has shown that S100B and C‐reactive protein levels in peripheral blood can identify patients at risk of delirium (Dillon et al., 2017; Hall et al., 2013; van Munster, Bisschop, et al., 2010; van Munster, Korevaar, et al., 2010; van Munster et al., 2009).