[1] Univ Milan, Dept Sci Salute, San Paolo Hosp, Resp Unit,ASST Santi Paolo & Carlo, Milan, Italy
[2] ASST Lodi, UOC Pneumol, Lodi, Italy
[3] Univ Sassari, Dept Clin & Expt Med, Lung Dis Unit, Sassari, Italy
[4] Univ Politecn Marche, Dept Biomed Sci & Publ Hlth, Ancona, Italy
[5] AOU Osped Riuniti, Pulmonol Unit, Ancona, Italy
[6] ASST Mantova, Dipartimento Cardiotoracovasc, Unita Operat Pneumol, Mantua, Italy
[7] UTIR, Mantua, Italy
[8] Univ Sassari, Dept Dept Clin & Expt Med, Clin Epidemiol & Med Stat Unit, Sassari, Italy