DPP4 and type 2 diabetes mellitus: Although the spike protein of the SARS‐CoV‐2 virus does not interact with human membrane‐bound DPP‐4 (CD26),43, 44 patients with T2D are thought to have dysregulated DPP‐4 levels, which might have a negative vascular impact, resulting in an increased risk of COVID‐19.45