1. Department of Dermato-Allergology; Copenhagen University Hospital Gentofte; Hellerup Denmark
2. National Allergy Research Centre; Department of Dermato-Allergology; Copenhagen University Hospital Gentofte; Hellerup Denmark
3. Department of Clinical Biochemistry; Copenhagen University Hospital Gentofte; Hellerup Denmark
4. Research Centre for Prevention and Health; Glostrup University Hospital; Glostrup Denmark
5. St John's Institute of Dermatology; Guy's Hospital; London U.K