1. Dermatology Department, AP‐HP Saint Louis Hospital Paris France
2. Dermatology Department Montpellier University Hospital Center Montpellier France
3. Internal Medicine Department, Referral Center for Autoimmune Cytopenia, AP‐HP, Mondor Hospital Paris Est Creteil University Creteil France
4. Post‐Emergency Department, AP‐HP, Mondor Hospital Paris Est Creteil University Creteil France
5. Pathology Department, AP‐HP, Saint‐Louis Hospital Université Paris Cité, INSERM U976 Paris France