1. Department of Pathophysiology and Transplantation University of Milan, IRCCS Fondazione Cà Granda Milano, Milan, Italy
2. Italian College of General Practitioners, Brescia, Italy
3. Department of Internal Medicine, University of Genoa, Genoa, Italy
4. University of Milan, Milan, Italy
5. University of Catania, Catania, Italy
6. Policlinico Vittorio Emanuale, Catania, Italy
7. Pneumology Unit, Riuniti Hospital, Ancona, Italy
8. ASL Ancona, Ancona, Italy
9. University of Messina, Messina, Italy
10. Pneumology Unit, Santa Corona Hospital, Savona, Italy
11. USSL7, Pieve di Soligo, Treviso, Italy
12. Cardio-Thoracic and Vascular Department, University of Pisa, Pisa, Italy
13. University of Ferrara, Ferrara, Italy
14. AOU Careggi, Firenze, Italy
15. University of Verona, Verona, Italy