1. Division of Dermatochemistry and Skin Allergy, Department of Chemistry and Molecular Biology; University of Gothenburg; SE-412 96 Gothenburg Sweden
2. National Allergy Research Centre, Department of Dermato-Allergology; Gentofte Hospital, University of Copenhagen; DK-2900 Hellerup Denmark
3. Institute of Environmental Medicine; Karolinska Institutet; SE-171 77 Stockholm Sweden
4. Copenhagen Denmark
5. School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Liverpool L3 3AF UK
6. Department of Medical Informatics, Biometry and Epidemiology; University Erlangen/Nürnberg; 91054 Erlangen Germany
7. Department of Cutaneous Allergy; St John's Institute of Dermatology, St Thomas' Hospital; London SE1 7EH UK