1. Department of Internal Medicine Toulouse University Hospital Toulouse France
2. CIC 1436, Team PEPSS Toulouse University Hospital Toulouse France
3. Department of Haematology, Hammersmith Hospital Imperial College London London UK
4. Department of Hematooncology Østfol Hospital and Institute of Clinical Medicine University of Oslo Oslo Norway
5. Department of Hematology Hospital Universitario de Burgos Burgos Spain
6. Oncology/Hematology University Children's Hospital Basel Basel Switzerland
7. Hospital Universitario Morales Meseguer Centro Regional de Hemodonación Universidad de Murcia IMIB‐Arrixaca CB15/00055‐CIBERER Murcia Spain
8. Department of Internal Medicine, National Referral Center for Autoimmune Cytopenias Créteil University Hospital Créteil France
9. Department of Haematology, Barts and The London School of Medicine and Dentistry Queen Mary University of London London UK
10. DSM University of Trieste Trieste Italy
11. Pediatric Hematology University Hospital Centre d’Investigation Clinique Plurithématique CICP INSERM Bordeaux
12. Centre de Référence National des Cytopénies Auto‐Immunes de l'Enfant (CEREVANCE) Bordeaux France
13. Department of Clinical Epidemiology, Department of Clinical Medicine Aarhus University and Aarhus University Hospital Aarhus Denmark
14. Department of Haematology and Department of Clinical Research Odense University Hospital and University of Southern Denmark Odense Denmark
15. Department of Paediatric Haematology Royal Manchester Children’s Hospital Manchester UK
16. Department of Medical Sciences University of Manchester Manchester UK
17. Department of Clinical Haematology Royal London Hospital, Barts Health London UK
18. Department of Clinical Haematology Guys and St Thomas’ NHS Foundation Trust London UK
19. Hematology Project Foundation Affiliated to the Hematology Department of the San Bortolo Hospital Vicenza Italy