1. Pediatric Clinic, Pietro Barilla Children’s Hospital, University of Parma, Parma, Italy.
2. Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Internal Medicine Department, Respiratory Unit and Cystic Fibrosis Adult Center, Milan, Italy.
3. Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy.