1. Department of Medical Informatics, Biometry and Epidemiology University of Erlangen/Nürnberg Erlangen Germany
2. Occupational Medicine Finnish Institute of Occupational Health Helsinki Finland
3. Department of Dermatology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
4. Department of Dermatology and Allergy Centre Odense University Hospital University of Southern Denmark Odense Denmark
5. Department of Dermatology University Hospital Basel Basel Switzerland
6. Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück OsnabrückGermany
7. Department of Occupational and Environmental Dermatology Skåne University Hospital Lund University Malmö Sweden
8. Department of Social Medicine, Occupational and Environmental Dermatology University of Heidelberg Heidelberg Germany
9. Unit of Dermatology Department of Biomedical Science and Human Oncology University of Bari Bari Italy
10. Department of Dermatology Hospital del Mar IMIM Universitat Autònoma de Barcelona Barcelona Spain
11. Department of Dermatology University Hospital and Faculty of Medicine University of Coimbra Coimbra Portugal
12. Contact Allergy Unit Department of Dermatology University Hospital KU Leuven Leuven Belgium
13. Guy's Hospital St John's Institute of Dermatology London UK
14. Department of Dermatology Amsterdam University Medical Centres Amsterdam The Netherlands
15. Department of Dermatology Leeds Teaching Hospitals NHS Trust Leeds UK
16. Department of Dermato‐Allergology National Allergy Research Centre Gentofte Hospital University of Copenhagen Hellerup Denmark