1. Department of Dermatology & Allergology; University of Ulm Albert Einstein Allee 23; D89081 Ulm Germany
2. Section of Hand and Plastic Surgery; University of Ulm Albert Einstein Allee 23; D89081 Ulm Germany
3. Department of Dermatology and Dermatosurgery; Helios Hospital Rottweil; Krankenhausstr. 30 D78628 Rottweil Germany