[1] University of Verona,Unit of Epidemiology & Medical Statistics, Department of Diagnostics and Public Health
[2] University of Verona,School of Medicine in Sports and Exercise, Department of Medicine
[3] University of Verona and Azienda Ospedaliera Universitaria Integrata of Verona,Department of Medicine, Respiratory Medicine Unit
[4] Mekelle University,Department of Epidemiology, School of Public Health
[5] University of Verona,Unit of Occupational Medicine, Department of Diagnostics and Public Health