1. National Allergy Research Centre, Department of Dermato-Allergology; Copenhagen University Hospital Gentofte; 2900 Hellerup Denmark
2. Dermatology Clinic; 9000 Aalborg Denmark
3. Dermatology Clinic; 2610 Rødovre Denmark
4. Dermatology Clinic; 7400 Herning Denmark
5. Department of Dermatology and Allergy Centre; Odense University Hospital; 5000 Odense C Denmark
6. Department of Dermatology; Aarhus University Hospital; 8000 Aarhus Denmark
7. Dermatology Clinic; 1570 Copenhagen Denmark
8. Dermatology Clinic; 5700 Svendborg Denmark
9. Dermatology Clinic; 7100 Vejle Denmark
10. Dermatology Clinic; 4400 Kalundborg Denmark
11. Dermatology Clinic; 2970 Hørsholm Denmark
12. Dermatology Clinic; 2880 Bagsvaerd Denmark
13. Research Centre for Hairdressers and Beauticians, Department of Dermato-Allergology; Copenhagen University Hospital Gentofte; 2900 Hellerup Denmark