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This document is an addition to the research protocol for The GLasses Against transmission of SARS-CoV-2 in the communitY (GLASSY) trial. The RCT has been registered in Clinical Trials (NCT05217797). This document was posted online before the analysis of the data took place.doi:10.5281/zenodo.6521814 fatcat:z5oxa5vzibegln7vkgyynijrqa