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During the COVID-19 pandemic, it has been important to both minimise the risk of infection and restore daily life. As a typical example, mass gathering events, such as sporting events, are gradually becoming more common, thanks to the measures taken to contain COVID-19. Some pilot studies have been launched at governments' initiative to investigate the risk of infection without measures such as face masks and physical distancing at mass gathering events, but the ethics of these studies shoulddoi:10.1093/qjmed/hcab163 pmid:34109393 fatcat:a6p36fkj7benjcj7omwkod22ku