1. Department of Dermatology; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
2. Department of Social Medicine, Occupational and Environmental Dermatology; University Heidelberg; Heidelberg Germany
3. Department of Occupational and Environmental Dermatology; Lund University, Skåne University Hospital; Malmö Sweden
4. Centro Studi GISED; Bergamo Italy
5. Dermatology Department; Inselspital University Hospital; Bern Switzerland
6. Department of Dermatology; University Hospital Jena; Jena Germany
7. Department of Dermatology, Faculty of Medicine; Coimbra University Hospital, University of Coimbra; Coimbra Portugal
8. Department of Dermatology; AULSS8 Berica, Ospedale San Bortolo; Vicenza Italy
9. Department of Dermatology; Lund University, Skåne University Hospital; Malmö Sweden