1. Department of Dermatology and Allergy, Herlev and Gentofte Hospital University of Copenhagen Hellerup Denmark
2. Department of Occupational and Environmental Dermatology Lund University Lund Sweden
3. Department of Occupational and Environmental Dermatology Lund University, Skåne University Hospital Malmö Sweden
4. Department of Dermatology and Allergy, National Allergy Research Centre Herlev and Gentofte Hospital, University of Copenhagen Hellerup Denmark