1. National Allergy Research Centre, Department of Dermatology and Allergy; Herlev and Gentofte Hospital, University of Copenhagen; Hellerup Denmark
2. Unit of Work Environment Toxicology; Institute of Environmental Medicine, Karolinska Institutet; Stockholm Sweden
3. Department of Dermatology and Allergy; Herlev and Gentofte Hospital, University of Copenhagen; Hellerup Denmark