Frontiers in Cardiovascular Medicine, Vol 7 (2021) Roberts, J, Pritchard, A L, Treweeke, A T, Rossi, A G, Brace, N, Cahill, P, Macrury, S M, Wei, J & Megson, I L 2021, ' Why Is COVID-19 More Severe in Patients With Diabetes? The Role of Angiotensin-Converting Enzyme 2, Endothelial Dysfunction and the Immunoinflammatory System ', Frontiers in Cardiovascular Medicine, vol. 7 . https://doi.org/10.3389/fcvm.2020.629933 Frontiers in Cardiovascular Medicine