1. Infectious Diseases Azienda Ospedaliera Universitaria Pisana Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
2. Department of Anaesthesia and Critical Care Medicine, Azienda Ospedaliera Universitaria Pisana, Pisa, Italy
3. Microbiology Unit, Azienda Ospedaliera Universitaria Pisana, Pisa, Italy
4. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine, University of Pisa, Pisa, Italy