A longitudinal study on symptom duration and 60-day clinical course in non-hospitalised COVID-19 cases in Berlin, Germany, March to May, 2020 Saad, Neil J. and Moek, Felix and Steitz, Fabienne and Murajda, Lukas and Bärnighausen, Till and Zoller, Thomas and Pörtner, Kirsten and Muller, Nadine, Eurosurveillance, 26, 2001757 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.43.2001757