1. Centre of Research on Health and Social Care ManagementSDA Bocconi School of Management (Bocconi University) Milan Italy
2. Clinical Epidemiology and Medical Statistics Unit, Department of Medical, Surgical and Experimental SciencesUniversity of Sassari Sassari Italy
3. Department of Pathophysiology and TransplantationUniversità degli Studi di Milano Head Internal Medicine Department, Respiratory Unit and Adult Cystic Fibrosis Center Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico Milano Italy