1. Department of Dermatology, Venerology and Allergology, Helios St. Elisabeth Hospital Oberhausen University Witten/Herdecke Oberhausen Germany
2. Institute of Pathology Mülheim an der Ruhr Germany
3. Department of Dermatology Helios Hospital Krefeld Krefeld Germany
4. Research Unit Dermatopathology, Department of Dermatology Medical University of Graz Graz Austria