1. Department of Medical and Surgical Sciences, University of Foggia, 71121 Foggia, Italy
2. Department of Infectious Diseases, Istituto Superiore di Sanità, 00162 Rome, Italy
3. Department of Public Health and Infectious Diseases, Sapienza University of Rome, 00185 Rome, Italy
4. Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy
5. Department of Prevention, South-East Tuscany Local Health Authority, 52100 Arezzo, Italy
6. Department of Medical and Surgical Sciences and Advanced Technologies “GF Ingrassia”, University of Catania, 95123 Catania, Italy