[1] Misericordia Hosp, Azienda USL Toscana Sud, Est Pneumol Dept, Grosseto, Italy
[2] Univ Roma Tor Vergata, PhD Program Dept Syst Med, Expt Med & Syst, Rome, Italy
[3] Natl Res Ctr, Clin Physiol Inst, Pisa, Italy
[4] Univ Florence, Careggi Univ Hosp, Dept Expt & Clin Med, Sect Resp Med, Largo A Brambilla 3, I-50134 Florence, Italy
[5] Univ Foggia, Inst Resp Dis, Dept Med & Surg Sci, Foggia, Italy
[6] Magna Graecia Univ Catanzaro, Dept Med & Surg Sci, Sect Resp Dis, Catanzaro, Italy
[7] Univ Milan, Dept Biomed & Clin Sci DIBIC, Div Pulm Dis, ASST Fatebenfratelli Sacco,Osped L Sacco, Milan, Italy
[8] Inst Clin Sci Maugeri IRCCS, Resp Rehabil Ist Telese, I-82037 Telese Terme, BN, Italy
[9] Univ Pavia, IRCCS San Matteo Hosp Fdn, Div Resp Dis, Pavia, Italy
[10] Perugia Hosp, Pneumol Dept, Perugia, Italy
[11] Univ Perugia, Sect Occupat Med Resp Dis & Toxicol, Perugia, Italy
[12] Univ Perugia, Terni Hosp, Occupat Med, Perugia, Italy
[13] Sapienza Univ, Dept Sense Organs, Policlin Umberto 1, Otorhinolaryngol Clin, Rome, Italy
[14] Casa Salute Scilla, Allergol Dept, Scilla, RC, Italy
[15] Univ Siena, Dept Med Surg & Neurosci, Resp Dis & Lung Transplant Unit, Siena, Italy
[16] Sapienza Univ Rome, Dept Clin & Mol Med, Div Pneumol, AOU St Andrea, Rome, Italy
[17] Univ Rome Tor Vergata Rome, Dept Expt Med, Resp Unit, Rome, Italy
[18] Univ Pisa, Dept Surg Med Mol Biol & Crit Care, Pisa, Italy