1. Department of Dermato-Venereology; Aarhus University Hospital; 8000 Aarhus Denmark
2. Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam; University of Amsterdam and VU University Amsterdam; Gustav Mahlerlaan 3004 1081 LA Amsterdam, The Netherlands
3. Department of Orthopaedic Surgery; Aarhus University Hospital; 8000 Aarhus Denmark
4. National Allergy Research Centre, Department of Dermato-Allergology; Copenhagen University Hospital Herlev-Gentofte; 2900 Hellerup Denmark