1 Radiology Unit, Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy.
2 Department of Clinical Sciences, Section of Radiology, University of Parma, Parma, Italy.
3 Clinical Epidemiology and Medical Statistics Unit, Department of Biomedical Sciences, University of Sassari, Research, Medical Education and Professional Development Unit, AOU Sassari, Sassari, Italy.
4 Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.
5 Cardio-Thoracic Unit and Adult Cystic Fibrosis Center, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy.