1. Department of Pathology University Hospital of Poitiers, France
2. Department of Public Health University Hospital of Poitiers INSERM CIC 1402 CHU Poitiers France F‐86021 Poitiers
3. Department of Pathology Saint‐Louis Hospital, AP‐HP, Université de Paris, INSERM U976 Paris France
4. Dermatology Clinic University Hospitals of Strasbourg, France
5. Department of Pathology University Hospital of Bordeaux Pessac France
6. LITEC EA 4331 Poitiers France