1. Department of Allergy; Hospital La Paz Institute for Health Research (IdiPAZ) and CIBER de Enfermedades Respiratorias (CIBERES); Madrid Spain
2. Department of Chest Medicine; Centre Hospitalier Universitaire de Mont-Godinne; Université Catholique de Louvain; Yvoir Belgium
3. Unidad de Gestión Clínica Allergy-IBIMA; Hospital Regional Universitario; Málaga Spain
4. Pulmonology Service; Hospital Universitari Vall d'Hebron; Universitat Autonoma de Barcelona; Barcelona Spain
5. CIBER de Enfermedades Respiratorias (CIBERES); Barcelona Spain
6. Division of Asthma and Allergy; Department of Chest Diseases; University Hospital; Fédération de Médecine Translationnelle de Strasbourg; Strasbourg University; Strasbourg France
7. Fachkrankenhaus Coswig GmbH Zentrum für Pneumologie, Allergologie, Beatmungsmedizin, Thorax- und Gefäßchirurgie; Coswig Germany
8. Department of Public Health, Experimental and Forensic Medicine; University of Pavia; Pavia Italy
9. Occupational Physician's Division; Local Health Authority of Sassari; Sassari Italy
10. IPA Institute for Prevention and Occupational Medicine of the German Social Accident Insurance; Institute of the Ruhr-Universität Bochum; Bochum Germany
11. Department of Allergy; Fundación Jiménez Díaz, and CIBER de Enfermedades Respiratorias (CIBERES); Madrid Spain
12. Formerly Department of Clinical and Experimental Medicine; University of Perugia; Perugia Italy
13. Department of Medicine and Dalla Lana School of Public Health; University of Toronto; Toronto ON Canada
14. Respiratory Division Toronto Western Hospital; Gage Occupational and Environmental Health Unit; St Michael's Hospital; Toronto ON Canada
15. Department of Occupational Diseases and Toxicology; Nofer Institute of Occupational Medicine; Lodz Poland
16. Centre de Pneumologie; Institut Universitaire de Cardiologie et de Pneumologie de Québec; Université Laval; Québec City QC Canada