Camargo, E.M. de, Piola, T.S., Santos, L.P. dos, Borba, E.F. de, Campos, W. de and Silva, S.G. da 2021. Frequency of physical activity and stress levels among Brazilian adults during social distancing due to the coronavirus (COVID-19): cross-sectional study. São Paulo Medical Journal. 139, 4 (Jul. 2021), 325–330.