1. Department of Dermatology University of Groningen, University Medical Center Groningen Groningen The Netherlands
2. Department of Medical Informatics, Biometry and Epidemiology Friedrich‐Alexander‐University Erlangen/Nürnberg Erlangen Germany
3. Department of Dermatology University Hospital of Puerto Real, University of Cádiz Cádiz Spain
4. Department of Dermatology University of Naples Federico II Naples Italy
5. Department of Advanced Biomedical Sciences University of Naples Federico II Naples Italy
6. Department of Dermatology University Hospital Zürich Zürich Switzerland
7. Department of Dermatology University Hospital Zürich and Clinic of Dermatology and Allergology, Kantonsspital St Gallen Zürich Switzerland
8. Department of Dermatology University Hospital Carl Gustav Carus, Technical University of Dresden Dresden Germany
9. Department of Dermatology Allergy Unit, University Hospital Basel Basel Switzerland
10. Department of Dermatology, Venereology and Allergology University Medical Center Göttingen Göttingen Germany
11. Department of Dermatology Poznan University of Medical Sciences Poznan Poland
12. Department of Dermatology, Venereology and Allergology Ruhr University Bochum Bochum Germany
13. Department of Dermatology Hospital del Mar, Universitat Autònoma de Barcelona Barcelona Spain
14. Department of Dermatology and Environmental Medicine Institute for Interdisciplinary Dermatologic Prevention and Rehabilitation (iDerm), University of Osnabrück, Lower Saxony Institute for Occupational Dermatology (NIB) Osnabrück Germany
15. Department of Dermatology and Venereology Medical University of Graz Graz Austria
16. Faculty of Medicine and Health Science Institute of Medical Science, Jan Kochanowski University Kielce Poland
17. Department of Dermatology Nofer Institute of Occupational Medicine Łódź Poland
18. Department of Dermatology University Hospital of Erlangen, University of Erlangen‐Nuremberg (FAU) Erlangen Germany
19. Division of Allergology Paul‐Ehrlich‐Institut Langen Germany
20. Department of Dermatology‐Allergology and Occupational Dermatology Amsterdam University Medical Centers Amsterdam The Netherlands
21. Department of Dermatology Hospital Universitario la Princesa Madrid Spain
22. Department of Dermatology and Allergology Cantonal Hospital Aarau Aarau Switzerland
23. Department of Dermatology and Allergology University Hospital Jena Jena Germany
24. Department of Dermatology Inselspital, Bern University Hospital, University of Bern Bern Switzerland
25. Department of Experimental Dermatology and Cosmetology, Faculty of Pharmacy Jagiellonian University Medical College Krakow Poland
26. Dermatologie et vénéréologie FMH, Center Médical d'Epalinges Epalinges Switzerland
27. Department of Skin and Venereal Diseases Lithuanian University of Health Sciences Kaunas Lithuania
28. Department of Dermatology, Occupational Dermatology University Hospital Heidelberg Heidelberg Germany
29. Division Occupational Medicine Finnish Institute of Occupational Health Helsinki Finland