1. Department of Medical and Surgical Sciences, University “Magna Græcia” of Catanzaro, Catanzaro, Calabria, Italy
2. Nuffield Department of Medicine, Respiratory Medicine Unit, University of Oxford, Oxford, UK
3. Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC, Canada
4. Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy
5. Department of Health Sciences, University “Magna Græcia” of Catanzaro, Catanzaro, Italy