Effect of Angiotensin-Converting Enzyme Inhibitor and Angiotensin Receptor Blocker Initiation on Organ Support–Free Days in Patients Hospitalized with COVID-19 (NCT02735707): a randomized clinical trial that studies whether ACE inhibitor or angiotensin receptor blocker (ARB) initiation improves outcomes in hospitalized COVID-19 patients. This evidence concerns the gene ACE and COVID-19.