1. Dermatology Unit, IRCCS Ospedale Policlinico San Martino Genoa Italy
2. Department of Medicine and Surgery, School of Medicine University of Milano‐Bicocca Monza Italy
3. Laboratory Cerba HealthCare Milano Italy
4. Pathology Unit, Galliera Hospitals Genoa Italy
5. Dermatology Unit, Department of Medical Sciences and Public Health University of Cagliari Cagliari Italy
6. Pathology Service, Department of Medical Sciences and Public Health University of Cagliari Cagliari Italy
7. Division of General Medicine Asl 3 Genovese Genoa Italy
8. Dermatology Clinic, Fondazione IRCCS Policlinico San Matteo Pavia Italy
9. Department of Clinical‐Surgical, Diagnostic and Pediatric Sciences University of Pavia Pavia Italy
10. Dermatology Clinic Vita‐Salute S.Raffaele University Milan Italy