D. Rossi, R. Croci, P. Affanni, A. Odone, and C. Signorelli, “Influenza vaccination coverage in Lombardy Region: a twenty-year trend analysis (1999-2019)”, Acta Biomed, vol. 91, no. 3-S, pp. 141–145, Apr. 2020, doi: 10.23750/abm.v91i3-S.9455.