FGF23 and diabetes mellitus: Multivariate analysis indicates that SARS-CoV-2 infection predictors (Table 3) included age above 60 years (HR: 2.63 [1.35–5.11], p = 0.004), presence of diabetes (HR: 1.92 [1.05–3.48], p = 0.033) and high plasma FGF23 levels (HR: 1.92 [1.03–3.56], p = 0.039).