1. Department of Dermatology; Darmstadt hospital; Darmstadt Germany
2. Department of Dermatology; Greifswald University Hospital; Greifswald Germany
3. Laser clinic Karlsruhe; Karlsruhe Germany
4. Departments of Medical Statistics, Biomathematics and Information Processing; Medical Faculty of Heidelberg University; Mannheim University Hospital; Mannheim Germany
5. Department of Dermatology; Medical Faculty of Heidelberg University; Mannheim University Hospital; Mannheim Germany