1. Department of Hematology and Pediatric Immunology Nantes University Hospital Nantes France
2. Department of Dermatology Nantes University Hospital Nantes France
3. Centre de Pathologie Atlantique La Rochelle France
4. Department of Anatomic Pathology Necker Hospital Paris France
5. Clinique Sud Vendée Fontenay‐le‐Comte France
6. UMR 1280 PhAN INRA Nantes France