1. Clinica Malattie Infettive, Ospedale Policlinico San Martino - IRCCS, Genoa, Italy
2. Department of Health Sciences, University of Genoa, Genoa, Italy
3. Infectious Diseases Division, Department of Medicine University of Udine, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
4. Global Medical Affairs, Pfizer INC, New York, NY, USA