[1] Univ Milan, Dept Pathophysiol & Transplantat, Milan, Italy
[2] IRCCS Fdn Ca Granda Osped Maggiore Policlin, Resp Unit, Dept Internal Med, Milan, Italy
[3] IRCCS Fdn Ca Granda Osped Maggiore Policlin, Adult Cyst Fibrosis Ctr, Milan, Italy
[4] Norton Infect Dis Inst, Norton Healthcare, Louisville, KY USA
[5] Univ Louisville, Div Infect Dis, Louisville, KY 40292 USA