1. Cystic Fibrosis Unit, Pediatric Clinic, Department of Medicine and Surgery, University of Parma, 43126 Parma, Italy
2. Rehabilitation Medicine Service, Rehabilitation Geriatrics Department of the University Hospital of Parma, 43126 Parma, Italy
3. Respiratory Disease and Lung Function Unit, Department of Medicine and Surgery, Hospital of Parma, 43126 Parma, Italy