1. Competence Centre skin tegral®, Department of Dermatology; University Medical Centre Freiburg; Hauptstrasse 7 D-79104 Freiburg Germany
2. Department of Environmental Health Sciences; University Medical Centre Freiburg; Breisacher Strasse 115B D-79106 Freiburg Germany
3. CVderm, Department of Dermatology; University Medical Centre Hamburg Eppendorf; Martinistr. 52 D-20246 Hamburg Germany