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