1. Pulmonary Disease Unit, Department of Internal Medicine Azienda Ospedali Riuniti Ancona Italy
2. Department of Biomedical Sciences and Public Health Università Politecnica delle Marche Ancona Italy
3. Department of Clinical Sciences and Community Health Universitá degli Studi di Milano Milan Italy
4. Department of Public Health, Experimental and Forensic Medicine University of Pavia Pavia Italy
5. Department of Epidemiology and Health Services Research, Centre for Primary Care and Public Health (Unisanté) University of Lausanne Lausanne Switzerland
6. Stony Brook Cancer Center Stony Brook University Stony Brook New York USA
7. Department of Medical and Surgical Sciences University of Bologna Bologna Italy
8. Department of Humanities Pegaso Online University Naples Italy