1. Department of Dermatology; Örebro University Hospital; SE-701 82 Örebro Sweden
2. Department of Occupational and Environmental Dermatology; Skåne University Hospital, Lund University; SE-205 02 Malmö Sweden
3. Institute of Environmental Medicine, Karolinska Institutet; SE-171 77 Stockholm Sweden
4. Unit of Occupational and Environmental Dermatology; Centre for Occupational and Environmental Medicine, SE-113 65 Stockholm County Council; Stockholm Sweden
5. Dermatology and Venereology, Department of Public Health and Clinical Medicine; Umeå University; SE-901 85 Umeå Sweden
6. Department of Dermatology; Faculty of Medicine and Health, Örebro University; SE-701 82 Örebro Sweden