1. Allergology and Immunology Unit; Fondazione ‘Salvatore Maugeri’; Institute of Care and Research; Scientific Institute of Pavia; Pavia Italy
2. Department of Occupational and Environmental Medicine; Imperial College; London UK
3. Department of Clinical and Experimental Medicine; Occupational Allergy Unit; Terni Hospital; University of Perugia; Terni Italy
4. Section of Allergology; Department of Internal Medicine; Erasmus MC; Rotterdam the Netherlands
5. Department of Allergy; Hospital La Paz Institute for Health Research (IdiPAZ), and CIBER de Enfermedades Respiratorias CIBERES; Madrid Spain
6. Department of Allergy; Fundación Jiménez Díaz, and CIBER de Enfermedades Respiratorias CIBERES; Madrid Spain
7. Department of Otolaryngology, Head and Neck Surgery; School of Medicine; Temple University; Philadelphia PA USA
8. Department of Chest Medicine; Centre Hospitalier Universitaire de Mont-Godinne; Université Catholique de Louvain; Yvoir Belgium
9. Department of Occupational Diseases; Nofer Institute of Occupational Medicine; Lodz Poland
10. Department of Chest Medicine; Hôpital du Sacré-Coeur de Montréal; Université de Montréal; Montreal Canada