Affiliations: Division of Respiratory and Allergic Diseases, Dept of Respiratory Diseases, High Speciality Hospital Antonio Cardarelli, Naples, Italy. University of Florence, Florence, Italy. First Division of Pneumology, High Speciality Hospital ‘‘V. Monaldi’’ and University ‘‘Federico II’’ Medical School, Naples, Italy. EPAR, UMR-S 1136, Institute Pierre Louis of Epidemiology and Public Healt...