1. Section of Dermatology; Department of Health Sciences (DISSAL); University of Genoa and IRCCS San Martino-IST University Hospital; Genoa Italy
2. Section of Dermatology; University Hospital of Saint-Etienne; Saint-Etienne France
3. Kempf and Pfaltz; Histological Diagnostics and Department of Dermatology; University Hospital of Zurich; Zurich Switzerland
4. Department of Surgical and Diagnostic Sciences (DISC); Pathology Unit University of Genoa and IRCCS San Martino-IST University Hospital; Genoa Italy
5. Department of Dermatology; Ed. Herriot Hospital Group; Lyon France