1. Respiratory Diseases Unit, Department of Medical and Surgical Sciences & Neurosciences, University of Siena, 53100 Siena, Italy
2. Rheumatology Unit, Department of Medicine, Surgery & Neurosciences, University of Siena, 53100 Siena, Italy
3. Diagnostic and Interventional Bronchoscopy Unit, Cardio-Thoracic and Vascular Department, Azienda Ospedaliera Universitaria Senese (AOUS), University Hospital of Siena, 53100 Siena, Italy