1. Department of Dermatology; The Saarland University Hospital; Homburg/Saar Germany
2. Department of Dermatology; University Hospital Essen; Essen Germany
3. Department of Biophysics; The Saarland University; Homburg/Saar Germany
4. Department of Dermatology; University Hospital Schleswig-Holstein; Kiel Germany
5. The Wistar Institute; Philadelphia PA USA