1. Departments of Dermatology and Histopathology, Royal Victoria Infirmary , Newcastle upon Tyne , UK
2. Departments of Pathology, University Hospitals Birmingham , UK
3. Department of Dermatology, Norfolk and Norwich University Hospital , Norwich , UK
4. Norwich Medical School, University of East Anglia , Norwich , UK
5. National Disease Registration Service and NHS Digital , Leeds , UK
6. Centre for Cell Biology and Cutaneous Research, Blizard Institute, Queen Mary University of London , London , UK
7. Departments of Dermatology and Pathology, Royal London Hospital, Barts Health NHS Trust , London , UK
8. Departments of Pathology, Royal London Hospital, Barts Health NHS Trust , London , UK
9. Departments of Histopathology, Royal Victoria Infirmary , Newcastle upon Tyne , UK
10. Departments of Dermatology and Pathology, University Hospitals Birmingham , UK
11. Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne , UK