1. Department of Medical Sciences, University of Ferrara, Emilia-Romagna, Italy
2. Department of Experimental Medicine, University of Rome ‘Tor Vergata,’ Rome, Italy
3. Department of Health Science, Università di Milano, Bergamo, Italy
4. Department of Internal Medicine, University of Genoa, Genoa, Italy
5. Division of Respiratory Diseases, IRCCS Policlinico San Matteo Foundation, University of Pavia, Pavia, Italy
6. Medineos Observational Research, Modena, Emilia-Romagna, Italy
7. Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Italy
8. Internal Medicine and Geriatrics, Università Politecnica delle Marche and IRCCS-INRCA, Ancona, Italy
9. Boehringer Ingelheim Milano, Italy
10. DIBIMIS, University of Palermo, Palermo, Italy
11. Department of Biomedical and Clinical Sciences (DIBIC), Università di Milano, Division of Respiratory Diseases, ‘L. Sacco’ Hospital, Via G.B. Grassi 74, Milan 20157, Italy