1. Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
2. Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
3. Department of Respiratory Medicine, AZ Nikolaas, Sint-Niklaas, Belgium
4. Department of Respiratory Medicine, Hospital del Mar (PSMAR)—IMIM, Barcelona, Spain
5. School of Health and Life Sciences, Universitat Pompeu Fabra, Barcelona, Spain
6. CIBER, Área de Enfermedades Respiratorias (CIBERES), ISCIII, Spain
7. Emergency Department, Humanitas Clinical and Research Center, IRCCS, Milan, Italy