1. Department of Internal Medicine, Referral Center for Autoimmune Cytopenia in Adults Toulouse University Hospital Toulouse France
2. Clinical Investigation Center 1436, Team PEPSS Toulouse University Hospital Toulouse France
3. Pediatric Hemato‐Immunology, Referral Center for Autoimmune Cytopenia in Children, CEREVANCE, CIC1401, INSERM CICP Bordeaux University Hospital Bordeaux France
4. Internal Medicine Department, Referral Center for Autoimmune Cytopenia in Adults, Hospital Henri Mondor, University Hospital Federation TRUE InnovaTive theRapy for immUne disordErs, Assistance Publique Hôpitaux de Paris (AP‐HP) University of Paris Est Créteil Créteil France