1. Department of Public Health and Infectious Diseases, Sapienza University of Rome, 00185 Rome, Italy
2. Local Health Unit Roma 1, 00168 Rome, Italy
3. National Institute of Health (Istituto Superiore di Sanità), 00162 Roma, Italy
4. Lazzaro Spallanzani National Institute for Infectious Diseases, 00149 Roma, Italy
5. District 1, Local Health Unit Roma 1, 00185 Rome, Italy