Puhan Milo A, Chiolero Arnaud, Fehr Jan, Cullati Stéphane
Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Hirschengraben 84, 8001 Zurich, Switzerland.
Population Heath Laboratory (#PopHealthLab), University of Fribourg, Fribourg, Switzerland.
BMJ. 2021 Apr 12;373:n917. doi: 10.1136/bmj.n917.