De Santi, Mauro, et al. “Seroprevalence of Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) Infection in an Italian Cohort in Marche Region, Italy”. Acta Biomedica Atenei Parmensis, vol. 92, no. 1, Jan. 2021, p. e2021070, https://doi.org/10.23750/abm.v92i1.10847.