[1] Inst Clin Physiol, CNR, Pulm Environm Epidemiol Unit, Pisa, Italy
[2] Inst Biomed & Mol Immunol IBIM A Monroy, CNR, Palermo, Italy
[3] Univ Pisa, Dept Surg Med Mol Pathol & Crit Area, Pisa, Italy
[4] Univ Hosp Pisa, Pulm Unit, Pisa, Italy
[5] Univ Hosp Pisa, Cardiothorac & Vasc Dept, Unit Pulmonol, Pisa, Italy
[6] Univ Palermo, Dept Econ Business & Stat, Palermo, Italy