1. Respiratory Diseases Unit, Department of Medical and Surgical Sciences,
2. Clinical and Experimental Medicine PhD Program, University of Modena Reggio Emilia, Modena, Italy;
3. Department of Surgical, Oncological and Oral Science (Di.Chir.On.S.), University of Palermo, Palermo, Italy;
4. Department of Anesthesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, Palermo, Italy;
5. Intensive Care Unit, University Hospital of Modena, and
6. Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genoa, Italy; and
7. Anesthesia and Critical Care, San Martino Policlinico Hospital, IRCCS for Oncology and Neurosciences, Genoa, Italy