ACE and COVID-19: Results from COVID-19 clinical studies may provide key insights into the differences between classes of drugs (ACE inhibitors, ARBs, mineralocorticoid receptor antagonists, statins) or the differences among drugs within the same drug class (lipophilicity, tissue vs. serum ACE inhibition) or whether outcomes from SARS-CoV-2 pneumonia in patients treated with RAAS modulators differ from other types of virus-induced pneumonia.