1. Department of Pulmonology, Haematology and Oncology. Division of Pulmonology and Allergology. High Speciality “A.Cardarelli” Hospital, Naples, Italy
2. Post-graduate School of Respiratory Medicine. Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
3. Department of Experimental Medicine and Surgery, University of Rome Tor Vergata, Rome, Italy
4. Division of Pulmonology, S. Corona Hospital, Pietra Ligure (Savona), Italy