1. Unit of Internal Medicine; Department of Clinical and Experimental Medicine; School of Emergency Medicine; University of Catania; Cannizzaro Hospital; Catania Italy
2. Unit of Bioinformatics and Computer Science; Department of Clinical and Experimental Medicine; University of Catania; Catania Italy
3. Department of Medical, Surgical, Neurologic, Metabolic and Geriatric Sciences; School of Emergency Medicine; Second University of Naples; Naples Italy
4. Unit of Lung Diseases; Department of Clinical and Experimental Medicine; University of Catania; Catania Italy