[1] Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico,Department of Pathophysiology and Transplantation
[2] Respiratory Unit and Cystic Fibrosis Adult Center,Clinical Epidemiology and Medical Statistics Unit, Department of Clinical and Experimental Medicine
[3] University of Milan,undefined
[4] University of Sassari,undefined
[5] Health Search,undefined
[6] Italian College of General Practitioners and Primary Care,undefined
[7] Italian College of General Practitioners and Primary Care,undefined