1. Department of Occupational and Environmental Dermatology; Skåne University Hospital, Lund University; Malmö SE-205 02 Sweden
2. Department of Dermatology; Sahlgrenska University Hospital; Gothenburg SE-413 45 Sweden
3. Institute of Environmental Medicine; Karolinska Institutet; Stockholm SE-171 76 Sweden
4. Unit of Occupational and Environmental Dermatology; Centre for Occupational and Environmental Medicine, Stockholm County Council; Stockholm SE-171 76 Sweden
5. Department of Dermatology; Örebro University Hospital; Örebro SE-701 85 Sweden
6. Department of Public Health and Clinical Medicine, Epidemiology and Dermatology & Venereology; Umeå University; Umeå SE-901 85 Sweden