[1] Univ Verona, Dept Med, Verona, Italy
[2] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Resp Unit, Dept Pathophysiol & Transplantat,Internal Med Dep, Milan, Italy
[3] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Cyst Fibrosis Adult Ctr, Milan, Italy
[4] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Pathophysiol & Transplantat, Cardiothorac Unit, Milan, Italy
[5] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Adult Cyst Fibrosis Ctr, Milan, Italy
[6] Azienda Osped Univ Integrata Verona, Cyst Fibrosis Ctr, Verona, Italy
[7] Azienda Osped Univ Integrata Verona, Endoscopy Unit, Verona, Italy
[8] Erasmus Univ, Med Ctr, Dept Gastroenterol & Hepatol, Rotterdam, Netherlands