1. Clinica del Lavoro’ Foundation, Medical Centre of Cassano Murge, Cassano Murge (Bari), Italy
2. Respiratory Diseases Clinic, Second Faculty of Medicine, University of Naples, Naples, Italy
3. Respiratory Diseases Institute, First Faculty of Medicine, University of Naples, Naples, Italy
4. Medical Department, Farmades SpA, Rome, Italy
5. Respiratory Diseases Institute, University of Messina, Messina, Italy
6. Respiratory Diseases Institute, University of Catania, Catania, Italy
7. Pneumology Division, City Hospital of Alessandria, Alessandria, Italy
8. Respiratory Diseases Institute, University of Milan, Milan, Italy
9. Respiratory Diseases Institute, University of Modena, Modena, Italy
10. Occupational Medicine Institute, University of Messina, Messina, Italy
11. Tuberculosis Clinic, University of Genoa, Genoa, Italy
12. Tuberculosis Clinic, University of Pavia, Pavia, Italy