1. Department of Urology, University of Ulm, Ulm, Germany
2. Department of Urology, Mannheim Medical Center, University of Heidelberg, Mannheim, Germany
3. Department of Dermatology and Venerology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
4. Department of Experimental Dermatology, Mannheim Medical Center, University of Heidelberg, Mannheim, Germany