1. National Allergy Research Centre, Department of Dermatology and Allergy Copenhagen University Hospital Herlev‐Gentofte Hellerup Denmark
2. Department of Occupational and Environmental Medicine Bispebjerg and Frederiksberg Hospital, University of Copenhagen Copenhagen Denmark
3. Unit of Social Medicine Copenhagen University Hospital Frederiksberg Frederiksberg Denmark
4. National Research Centre for the Working Environment Copenhagen Denmark
5. Department of Dermatology Environmental Health and Health Theory, University of Osnabrück and Institute of Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück Osnabrück Germany