1. Department of Dermatology; Bispebjerg Hospital, University of Copenhagen; 2400 Copenhagen Denmark
2. Department of Dermatology, Environmental Medicine, Health Theory; Lower Saxoninan Institute of Occupational Dermatology, University of Osnabrueck; D-49069 Osnabrueck Germany
3. Department of Dermatology; University of Lübeck; 23538 Lübeck Germany
4. Centre for Comprehensive Inflammation Medicine, University Hospital Schleswig-Holstein Campus Lübeck; 23538 Lübeck Germany
5. Coronel Institute of Occupational Health, Academic Medical Centre; 1105 AZ Amsterdam The Netherlands