[1] Univ Siena, Siena, Italy
[2] Univ Florence, Florence, Italy
[3] Osped Maggiore Policlin, Cyst Fibrosis Microbiol Lab, IRCCS Fdn Ca Granda, Milan, Italy
[4] Univ Milan, Dept Pathophysiol & Transplantat, Dept Internal Med, Resp Unit, Milan, Italy
[5] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Cyst Fibrosis Adult Ctr, Milan, Italy
[6] Zambon SpA, Corp Resp Med Affairs, Bresso, Italy