Ferrara, Pietro, et al. “Acceptance of Yellow Fever Vaccine in the Older Traveller: a Cohort Study: Yellow Fever Vaccination in Elderly: Adherence and Challenges”. Acta Biomedica Atenei Parmensis, vol. 92, no. 4, Sept. 2021, p. e2021098, https://doi.org/10.23750/abm.v92i4.11619.