1. Department of Occupational and Environmental Dermatology Lund University, Skåne University Hospital Malmö Sweden
2. School of Medical Sciences Örebro University Örebro Sweden
3. Contact Allergy Unit, Department of Dermatology, University Hospital Antwerp (UZA) and Research Group Immunology University of Antwerp Antwerp Belgium
4. Department of Dermatology Bispebjerg University Hospital Copenhagen Denmark
5. Department of Dermatology, Venereology and Allergology University Medical Center Göttingen Göttingen Germany
6. Section of Dermatology, DIMEPREJ Department University “Aldo Moro” Bari Italy
7. Department of Dermatology, Hospital del Mar and Research Institute de Barcelona Universitat Pompeu Fabra Barcelona Spain
8. Clinic of Dermatology, Coimbra University Hospital and Faculty of Medicine University of Coimbra Coimbra Portugal
9. Department of Dermatology Herlev and Gentofte Hospital Copenhagen Denmark
10. Dermato‐Allergology and Occupational Dermatology Amsterdam University Medical Centers Amsterdam The Netherlands
11. Dermatology Section, Department of Medicine and Surgery University of Perugia Perugia Italy
12. Leeds Teaching Hospitals, NHS Trust Leeds UK