1. Local Health District 2, Local Health Authority Roma 1, 00193 Rome, Italy
2. Department of Epidemiology of the Regional Health Service of the Lazio Region, Local Health Authority Roma 1, Via Cristoforo Colombo, 112, 00154 Rome, Italy
3. Local Health District 13, Local Health Authority Roma 1, 00193 Rome, Italy
4. Department of Public Health and Infectious Diseases, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy