1. University Hospital Careggi, 18561, Experimental and Clinical Medicine, Firenze, Toscana, Italy;
2. Morgagni Pierantoni Hospital, Pulmonology, Forlì, Italy
3. Morgagni-Pierantoni Hospital, 18568, Department of Diseases of the Thorax, Forli, Emilia-Romagna, Italy
4. Mayo Clinic, Rochester, Minnesota, United States
5. Mayo Clinic Scottsdale, Scottsdale, Arizona, United States
6. S. Maria Nuova Hospital-I.R.C.C.S., Reggio Emilia, Italy, Department of Pathology, Reggio Emilia, Italy
7. Royal Brompton and Harefield Nathional Health Service Foundation Trust, Interstitial Lung Disease Unit, London, United Kingdom of Great Britain and Northern Ireland
8. University of Catania, 9298, Department of Clinical and Experimental Medicine, Catania, Sicilia, Italy
9. University of Catania, Department of Internal and Specialistic Medicine, Catania, Italy
10. University of Florence , Clinical and Experimental Medicine, Florence, Italy
11. Azienda Ospedaliero Universitaria Careggi, 18561, Firenze, Toscana, Italy
12. University Hospital Careggi, 18561, Department of Experimental and Clinical Medicine, Firenze, Toscana, Italy
13. University of Florence, 9300, Department of Experimental and Clinical Medicine, Firenze, Toscana, Italy
14. Ravenna Medical Center, 46820, Pathologic Anatomy, Ravenna, Emilia-Romagna, Italy
15. GB Morgagni Hospital, Department of Diseases of the Thorax, Forlì, Italy
16. GB Morgagni Hospital, Pathology Unit, Forlì, Italy
17. Radiology Dept., Forlì, Italy