1 Clinical Epidemiology and Medical Statistics Unit, Department of Biomedical Sciences, University of Sassari - Research, Medical Education and Professional Development Unit, AOU Sassari, Sassari, Italy.
2 Division of Infection, Barts Health NHS Trust, London, UK.
3 Fondazione S Maugeri, IRCCS, Care and Research Institute, Tradate 21049, Italy; Public Health Consulting Group, Lugano, Switzerland.
4 Fondazione S Maugeri, IRCCS, Care and Research Institute, Tradate 21049, Italy.
5 Division of Infection and Immunity, University College London and NIHR Biomedical Research Centre, UCL Hospitals NHS Foundation Trust, London, UK.
6 Fondazione S Maugeri, IRCCS, Care and Research Institute, Tradate 21049, Italy. Electronic address: giovannibattista.migliori@fsm.it.