1. Department of Occupational and Environmental Dermatology Lund University, Skåne University Hospital Malmö Sweden
2. Department of Dermatology and Allergy Centre Odense University Hospital, and Dermatological Investigations Scandinavia, Institute of Clinical Research, University of Southern Denmark Odense Denmark
3. Department of Dermatology Hospital del Mar, IMIM, Universitat Autònoma Barcelona Spain
4. National Allergy Research Centre, Department of Dermatology and Allergy, Gentofte Hospital University of Copenhagen Hellerup Denmark