1. Department of Dermatology, Venereology, and Allergology, HELIOS St. Elisabeth Hospital Oberhausen; University of Witten-Herdecke; Oberhausen Germany
2. Department of Dermatology and Venereology; University of Cologne; Cologne Germany
3. Pathology Institute Rhein-Ruhr; Mülheim an der Ruhr Germany
4. Department of Dermatology, Allergy and Dermatosurgery, HELIOS Hospital Wuppertal; University Witten/Herdecke; Wuppertal Germany