1. Unit of Occupational Medicine; University Hospital of Verona; Verona Italy
2. Helmholtz Zentrum München - German Research Center for Environmental Health; Institute of Epidemiology I; Neuherberg Germany
3. Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine; University Hospital Munich; Ludwig Maximilians University Munich; Munich Germany
4. Department of Public Health; Section of Environment, Occupation and Health; Danish Ramazzini Centre; Aarhus University; Aarhus Denmark
5. Centre for Research in Environmental Epidemiology (CREAL); Barcelona Spain
6. IMIM (Hospital del Mar Medical Research Institute); Barcelona Spain
7. Universitat Pompeu Fabra (UPF); Barcelona Spain
8. CIBER Epidemiología y Salud Pública (CIBERESP); Barcelona Spain
9. Department of Public Health and Clinical Medicine; Division of Occupational and Environmental Medicine; Umea University; Umea Sweden
10. Department of Medical Sciences/Respiratory, Allergy and Sleep Research; Uppsala University; Uppsala Sweden
11. Inserm; UMR 1152; Pathophysiology and Epidemiology of Respiratory Diseases; Paris France
12. University Paris Diderot Paris 7; UMR 1152; Paris France
13. Department of Medical Science/Occupational and Environmental Medicine; Uppsala University; Uppsala Sweden
14. Centre for International Health; University of Bergen; Bergen Norway
15. Department of Occupational Medicine; Haukeland University Hospital; Bergen Norway
16. Unit of Biostatistics and Clinical Epidemiology; Department of Public Health, Experimental and Forensic Medicine; University of Pavia; Pavia Italy
17. Respiratory Epidemiology and Public Health Group; Imperial College London; London United Kingdom
18. MRC-PHE Centre for Environment and Health; Imperial College; London United Kingdom
19. Unit of Epidemiology and Medical Statistics, Department of Diagnostics and Public Health; University of Verona; Verona Italy