1. Infectious Diseases Clinic, Department of Health Sciences, University of Genoa, Genoa and Hospital Policlinico San Martino – IRCCS, Genoa, Italy
2. Infectious Diseases Clinic, Department of Medicine University of Udine, Sanitaria Universitaria Integrata di Udine, Udine, Italy
3. Leeds Teaching Hospitals NHS Trust & University of Leeds, Leeds, UK