1. Clinic for Occupational and Environmental Medicine, Department of Respiratory Diseases University Hospitals Leuven Leuven Belgium
2. Centre for Environment and Health, Department of Public Health and Primary Care KU Leuven Leuven Belgium
3. Department of Respiratory Disease Algemeen Ziekenhuis Sint‐Jan Oostende Belgium
4. IDEWE, External Service for Prevention and Protection at Work Leuven Belgium
5. Department General Internal Medicine—Allergy and Clinical Immunology University Hospitals Leuven Leuven Belgium
6. Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation KU Leuven Leuven Belgium
7. Department of Dermatology University Hospital Antwerp (UZA) Edegem Belgium
8. Research Group Immunology University of Antwerp Antwerp Belgium