1. Department of Social Medicine, Occupational and Environmental Dermatology; University Heidelberg; Thibautstraße 3 69115 Heidelberg Germany
2. Department of Occupational and Environmental Dermatology; Skåne University Hospital; Lund University; Malmö Sweden
3. Department of Dermatology; Azienda Ospedaliera Papa Giovanni XXIII, Bergamo; Centro Studi GISED - FROM Presidio Ospedaliero Matteo Rota; Via Garibaldi 13/15 24122 Bergamo Italy
4. Department of Dermatology; University of Groningen; University Medical Center Groningen; Groningen the Netherlands
5. Department of Dermatology; University Hospital Jena; Jena Germany
6. Department of Dermatology; Coimbra University Hospital; Faculty of Medicine; University of Coimbra; Coimbra Portugal
7. Department of Dermatology; Skåne University Hospital; Lund University; Malmö Sweden