1. Dermatology Department AP‐HP Hôpital Saint‐Louis Paris France
2. Human immunology Pathophysiology Immunotherapy INSERM U976 Institut de Recherche Saint‐Louis Université de Paris Paris France
3. Department of Cellular Pathology North West London Pathology Imperial College Healthcare NHS Trust London UK
4. Department of Dermatology The Hillingdon Hospitals NHS Foundation Trust London UK