1. Information Network of Departments of Dermatology (IVDK) Institute at the University Medical Center Göttingen Göttingen Germany
2. Lower Saxony Institute of Occupational Dermatology University Medical Center Göttingen Göttingen Germany
3. Institute for Interdisciplinary Dermatologic Prevention and Rehabilitation (iDerm) University of Osnabrück Osnabrück Germany
4. Department of Dermatology, Environmental Medicine and Health Theory University of Osnabrück Osnabrück Germany
5. Lower Saxony Institute of Occupational Dermatology University of Osnabrück Osnabrück Germany
6. Department of Dermatology, Venereology and Allergology University Medical Center Göttingen Göttingen Germany
7. Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) BG Hospital Hamburg Hamburg Germany
8. Department of Occupational Dermatology BG Hospital Falkenstein Falkenstein Germany
9. Department of Occupational Dermatology University of Heidelberg Heidelberg Germany
10. Department of Dermatology, Allergy Unit University Hospital Erlangen Erlangen Germany
11. Division of Allergology, Paul‐Ehrlich‐Institut Federal Institute for Vaccines and Biomedicines Langen Germany
12. Department of Dermatology, Venereology and Allergology Ruhr University Bochum Bochum Germany