1 Department of Public Health of Rimini, Local Health Authority of Romagna, via Coriano 38, 47924, Rimini, Italy.
2 Department of Biomedical and Neuromotor Sciences, Unit of Hygiene, Public Health and Medical Statistics, University of Bologna, via San Giacomo 12, 40126, Bologna, Italy.
3 School of Specialization of Infectious and Tropical Diseases, University of Modena-Reggio Emilia, via Campi 213/b, 41125, Modena, Italy.
4 Department of Biomedical and Neuromotor Sciences, Unit of Hygiene, Public Health and Medical Statistics, University of Bologna, via San Giacomo 12, 40126, Bologna, Italy. Electronic address: erica.leoni@unibo.it.