1 Department of Clinical and Experimental Medicine University of Catania Catania, ItalyRespiratory Medicine UnitPoliclinico "G. Rodolico-San Marco" University HospitalCatania, Italy claudia.crimi@unict.it.
2 Department of Precision Medicine in Medical Surgical and Critical Care University of PalermoPalermo, ItalyDepartment of Anesthesia, Intensive Care and EmergencyPoliclinico Paolo GiacconeUniversity of PalermoPalermo, Italy.