1. Department of Haematology, Centre for HaematologyThe Royal London Hospital London UK
2. Department of HematologyHospital del Mar Barcelona Spain
3. Department of HematologyJósa András Teaching Hospital Nyíregyháza Hungary
4. Department of HematologyKaposi Mor Teaching Hospital Kaposvar Hungary
5. Mykolaiv Regional Clinical Hospital Mykolaiv Ukraine
6. argenx BVBAIndustriepark‐Zwijnaarde 7 Zwijnaarde Belgium
7. Department of Molecular and Cellular MedicineTexas A&M University Health Science Center College Station Texas
8. Centre for Cancer ImmunologyUniversity of Southampton Southampton UK
9. Service de Médecine Interne, Centre National de Référence des Cytopénies Auto‐Immunes de l'AdulteCentre Hospitalier Universitaire Henri‐Mondor, Assistance Publique‐Hôpitaux de Paris, Université Paris Est Créteil Créteil France
10. Jane Anne Nohl Division of Hematology, Department of MedicineUniversity of Southern California Los Angeles California
11. Department of HematologyMassachusetts General Hospital and Harvard Medical School Boston Massachusetts