1. Fondazione Policlinico Universitario A, Gemelli IRCCS, Infectious Diseases, Rome, Italy.
2. Department of Infectious Diseases, Istituto Superiore di Sanità, Rome, Italy.
3. Department of Safety and Bioethics, Section of Infectious Diseases, Catholic University of Sacred Heart, Rome, Italy.
4. Mater Olbia Hospital, Olbia, Italy.