1 Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy. francesco.blasi@unimi.it.
2 Internal Medicine Department, Respiratory Unit and Adult Cystic Fibrosis Center, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico Milan, 20122 Milan, Italy. francesco.blasi@unimi.it.