1. Section of Hygiene - Institute of Public Health, Università Cattolica del Sacro Cuore, IRCCS Fondazione Policlinico “Agostino Gemelli”, Rome, Italy
2. Department of Public Health and Infectious Diseases, Sapienza Università di Roma, Rome, Italy
3. Department of Clinical Governance, Local Health Authority of Reggio Emilia, Italy
4. General Directorate for Health Prevention, Ministry of Health, Rome, Italy
5. Department of Experimental Medicine, University of Perugia, Perugia, Italy