1. Department of Dermatology; Ruhr-University Bochum; Bochum Germany
2. Fachklinik Hornheide; Department of Dermatology and Dermato-Histo-Pathology; Münster Germany
3. Dermatopathology Duisburg; Duisburg Germany
4. Section of Dermatology and Venereology; Department of Medicine; University of Verona; Verona Italy