1. Department of Dermatology; Bispebjerg Hospital; University of Copenhagen Copenhagen Denmark
2. Occupational Medicine; Finnish Institute of Occupational Health; Helsinki Finland
3. Department of Dermatology and Allergy Centre; Odense University Hospital; University of Southern Denmark; Odense Denmark
4. Unit of Dermatology; Department of Biomedical Science and Human Oncology; University of Bari; Bari Italy
5. Department of Dermatology; Hospital del Mar; Institut Mar d′Investigations Mediques; Universitat Autònoma; Barcelona Spain
6. Department of Dermatology; University Hospital and Faculty of Medicine; University of Coimbra; Coimbra Portugal
7. Department of Dermatology; University Hospital; K. U. Leuven; Leuven Belgium
8. Cabinet de Dermatologie and Laboratoire de Dermatochimie; Strasbourg France
9. Department of Social Medicine, Occupational and Environmental Dermatology; University Hospital; Heidelberg Germany