DPP4 and COVID-19: Various authors emphasized anti-inflammatory properties of DPP-4 inhibitors with conflicting opinions on whether these effects are beneficial or detrimental in patients with COVID-19 (Bouhanick et al., 2020; Chen C. F. et al., 2020; Dalan, 2020; Drucker, 2020; Iacobellis, 2020; Kokic Males, 2020; Pinheiro et al., 2020).