1. St John's Institute of Dermatology; Guy's and St Thomas' NHS Foundation Trust; St Thomas's Hospital; London UK
2. Department of Oncology; Anatomic Pathology Unit; Gaetano Rummo General Hospital; Benevento Italy
3. Section of Dermatology; DISSAL and Unit of Pathology; University of Genoa; Genoa Italy
4. Department of Dermatopathology; St John's Institute of Dermatology; St Thomas' Hospital; London UK