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