Gori, Davide, et al. “Vaccine Hesitancy and Mandatory Immunizations in Emilia-Romagna Region: The Case of MMR Vaccine”. Acta Biomedica Atenei Parmensis, vol. 90, no. 3, Sept. 2019, pp. 394-7, https://doi.org/10.23750/abm.v90i3.8865.