1. Department of Dermato-Allergology; The National Allergy Research Centre, Copenhagen University Hospital Gentofte; Kildegårdsvej 28 DK-2900 Hellerup Denmark
2. Department of Dermato-Allergology; Research Centre for Hairdressers and Beauticians, Copenhagen University Hospital Gentofte; Kildegårdsvej 28 DK-2900 Hellerup Denmark