1 Department of Pathophysiology and Transplantation, University of Milan, Internal Medicine Department, Respiratory unit and Adult Cystic Fibrosis Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Francesco Sforza 35, 20122, Milan, Italy.
2 Department of Clinical and Experimental Medicine, University of Sassari Clinical Epidemiology and Medical Statistics Unit, Sassari, Italy.
3 Department of Biomedical and Clinical Sciences (DIBIC), University of Milan, Section of Respiratory Diseases, Ospedale L. Sacco, ASST Fatebenefratelli-Sacco, Milan, Italy.
4 Department of Medical Sciences, University of Milan, Respiratory Unit, San Paolo Hospital, Milan, Italy.
5 Division of Pulmonary Diseases and Critical Care Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
6 Intensive Care Unit, Hospital de Matarò, Consorci Sanitari del Maresme, Carretera de Cirera s/n, 08304 Matarò, Barcelona, Spain.
7 Internal Medicine Department, Centro Hospitalar do Porto, Porto, Portugal.
8 Department of Medical Specialties, Pneumology Unit, IRCCS Arcispedale Santa Maria Nuova, Azienda USL, Reggio Emilia, Italy.
9 Department of Pathophysiology and Transplantation, University of Milan, Internal Medicine Department, Respiratory unit and Adult Cystic Fibrosis Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Francesco Sforza 35, 20122, Milan, Italy. stefano.aliberti@unimi.it.