Facciolà, A., G. Visalli, A. Orlando, M. Bertuccio, P. Spataro, R. Squeri, I. Picerno, and A. Di Pietro. “Vaccine Hesitancy: An Overview on Parents’ Opinions about Vaccination and Possible Reasons of Vaccine Refusal”. Journal of Public Health Research, Vol. 8, no. 1, Mar. 2019, doi:10.4081/jphr.2019.1436.