1. Department of Medicine and Surgery, Respiratory Disease and Lung Function UnitUniversity of Parma Parma Italy
2. Department of Medicine, Respiratory Medicine Unit and Section of Internal MedicineUniversity of Verona and Azienda Ospedaliera Universitaria Integrata of Verona Verona Italy
3. Department of Internal Medicine, Interventional Pneumology UnitUniversity Hospital of Parma Parma Italy
4. Cardiology Division, Surgery DepartmentUniversity Hospital of Parma Parma Italy