1. Department of Chest Medicine; Centre Hospitalier Universitaire UCL Namur; Université Catholique de Louvain; Yvoir Belgium
2. Pôle de Santé Publique; Strasbourg University; Strasbourg France
3. Division of Asthma and Allergy; Department of Chest Diseases; University Hospital of Strasbourg and Fédération de Médecine translationnelle; Strasbourg University; Strasbourg France
4. Occcupational Medicine; Finnish Institute of Occupational Health; Helsinki Finland
5. Department of Occupational Diseases and Environmental Health; Nofer Institute of Occupational Medicine; Lodz Poland
6. Servei Pneumologia; Hospital Vall d'Hebron; Universitat Autonoma de Barcelona and CIBER de Enfermedades Respiratorias (CIBERES); Barcelona Spain
7. Department of Allergy; Fundacion Jimenez Dıaz and CIBER de Enfermedades Respiratorias (CIBERES); Madrid Spain
8. Department of Occupational Medicine; 1st Faculty of Medicine; Charles University; Prague Czech Republic
9. Occupational Lung Disease Unit; Birmingham Heartlands Hospital; Birmingham UK
10. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance (PA); Ruhr University; Bochum Germany
11. Cardio-Thoracic and Vascular Department; University of Pisa; Pisa Italy
12. Department of Occupational Medicine; Haukeland University Hospital; Bergen Norway
13. Unit of Occupational Medicine and Public Health; University of Padova; Padova Italy
14. Department of Medicine; Section of Occupational Medicine, Respiratory Diseases and Occupational and Environmental Toxicology; University of Perugia; Perugia Italy
15. Department of Occupational and Environmental Medicine; Royal Brompton Hospital and Imperial College (NHLI); Royal Brompton and Harefield NHS Foundation Trust; London UK
16. Department of Public Health, Experimental and Forensic Medicine; University of Pavia; Pavia Italy
17. Allergy and Immunology Unit; Istituti Clinici Scientifici Maugeri; IRCCS; Pavia Italy
18. Department of Allergy; Hospital La Paz; Institute for Health Research (IdiPAZ) and CIBER de Enfermedades Respiratorias (CIBERES); Madrid Spain
19. Department of Respiratory Medicine; North Manchester General Hospital; Manchester UK
20. Department of Pulmonary Medicine and Occupational Medicine; Odense University Hospital; Odense Denmark
21. Department of Allergy, Skin and Allergy Hospital; Helsinki University Central Hospital; Helsinki Finland
22. Institute for Occupational and Maritime Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany