1. Department of Medicine and Surgery, Respiratory Disease and Lung Function Unit, University of Parma, Parma, Italy
2. Pathology Unit, University Hospital of Parma, Parma, Italy
3. Department of Cardiothoracic and Vascular Diseases, Pneumology and Endothoracic Endoscopy Unit, University Hospital of Parma, Parma, Italy
4. Department of Medicine and Surgery, Respiratory Disease and Lung Function Unit, University of Parma