1. Interventional Pulmonology Unit, Policlinico Sant'OrsolaUniversity of Bologna Bologna Italy
2. Department of MedicineUniversity of Cincinnati Medical Center Cincinnati OH USA
3. Section of Respiratory Diseases, Department of Cardiac, Thoracic, Vascular Sciences and Public HealthUniversity of Padova Padova Italy
4. Department of Pulmonary MedicineCleveland Clinic Cleveland OH USA