Physical activity and the risk of SARS-CoV-2 infection, severe COVID-19 illness and COVID-19 related mortality in South Korea: a nationwide cohort study

Physical activity and the risk of SARS-CoV-2 infection, severe COVID-19 illness and COVID-19 related mortality in South Korea: a nationwide cohort study
Lee et al., British Journal of Sports Medicine, doi:10.1136/bjsports-2021-104203
https://c19early.org/lee6.html