[1] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Pathophysiol & Transplantat, Internal Med Dept,Resp Unit, Milan, Italy
[2] Cyst Fibrosis Adult Ctr, Milan, Italy
[3] Univ Sassari, Clin Epidemiol & Med Stat Unit, Dept Med, Surg,Expt Sci, Sassari, Italy
[4] Osped Niguarda Ca Granda, Villa Marelli Inst, TB Reference Ctr & Lab, Milan, Italy
[5] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Internal Med, Resp Unit, Milan, Italy
[6] Radboud Univ Nijmegen, Med Ctr, Dept Med Microbiol, Nijmegen, Netherlands