Castaldi, Silvana, et al. “Monitoring Emergency Calls and Social Networks for COVID-19 Surveillance. To Learn for the Future: The Outbreak Experience of the Lombardia Region in Italy”. Acta Biomedica Atenei Parmensis, vol. 91, no. 9-S, July 2020, pp. 29-33, https://doi.org/10.23750/abm.v91i9-S.10038.