1 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Cystic Fibrosis Adult Center, Milan, Italy stefano.aliberti@unimi.it.
2 University of Milan, Dept of Pathophysiology and Transplantation, Milan, Italy.
3 Clinical Epidemiology and Medical Statistics Unit, Dept of Biomedical Sciences, University of Sassari, Research, Medical Education and Professional Development Unit, AOU Sassari, Sassari, Italy.
4 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Cystic Fibrosis Adult Center, Milan, Italy.
5 Pneumology Dept, Polytechnic and University La Fe Hospital, Valencia, Spain.