1. Department of Internal MedicineUniversity Hospital Estaing, CHU Clermont‐Ferrand Clermont‐Ferrand France
2. Department of HematologyUniversity Hospital Estaing Clermont‐Ferrand France
3. Department of Internal MedicineUniversity Hospital François Mitterrand Dijon France
4. Department of Internal MedicineReference Center of Autoimmune Cytopenias, University Hospital Henri‐Mondor Créteil France
5. EA 4681 PEPRADEUniversité d'Auvergne Clermont‐Ferrand France