DPP4 and diabetes mellitus: The use of metformin was associated with decreased risk of mortality, HR 0.60 [0.54, 0.67], p < .0001 (Figure S3F)whilst smoking (Figure S3B),75, 166 diabetes type (Figure S3D)82, 117 and DPP4 inhibitor use (Figure S3G) were not identified as either risk or protective factors in the context of mortality of patients with diabetes with a COVID‐19 infection.