Data sources and search strategy
A systematic literature search was conducted to identify studies investigating the association between ACE inhibitors or ARBs and pneumonia or COVID-19 in PubMed. The last search was updated on June 6th, 2020. The following MeSH terms were used in PubMed: “Angiotensin-Converting Enzyme Inhibitors” or “Angiotensin Receptor Antagonists” or “Mineralocorticoid Receptor Antagonists” and “Pneumonia”. Detailed search terms and search strategy are described in the supplementary file. The references cited in the retrieved studies were hand-searched for the collection of missing relevant studies. Details of study selection and quality assessment as well as data extraction and analysis are provided in the supplementary materials.