R. Lembo, G. Landoni, L. Cianfanelli, and A. Frontera, “Air pollutants and SARS-CoV-2 in 33 European countries”., Acta Biomed, vol. 92, no. 1, p. e2021166, Feb. 2021, doi: 10.23750/abm.v92i1.11155.