Bundgaard, H, Bundgaard, J S, Raaschou-Pedersen, D E T, Mariager, A F, Schytte, N, von Buchwald, C, Todsen, T, Skovgaard, K, Trebbien, R, Andersen, M P, Benfield, T, Ullum, H, Torp-Pedersen, C & Iversen, K 2020, ' Face masks for the prevention of COVID-19-rationale and design of the randomised controlled trial DANMASK-19 ', Danish Medical Journal, vol. 67, no. 9, A05200363 . < https://ugeskriftet.dk/dmj/face-masks-prevention-covid-19-rationale-and-design-randomised-controlled-trial-danmask-19 > Technical University of Denmark Orbit University of Copenhagen