1. Department of Dermatology, Venereology and Allergology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
2. Department for Biomathematics and Medical Statistics, Faculty of Medicine Mannheim of the University of Heidelberg, Mannheim, Germany
3. Department of Dermatology and Phlebology, Vivantes Klinikum im Friedrichshain, Berlin, Germany