1. Neuroscience Institute University of Sheffield Sheffield UK
2. Department of Neurology and Sheffield NIHR Neuroscience BRC Sheffield Teaching Hospitals NHS Foundation Trust Sheffield UK
3. Department of Haematology Sheffield Teaching Hospitals NHS Foundation Trust Sheffield UK
4. Division of Clinical Medicine, School of Medicine and Population Health University of Sheffield Sheffield UK
5. Department of Rheumatology and Clinical Immunology—Charité–Universitätsmedizin Berlin Corporate member of Freie Universität Berlin, Humboldt‐Universität zu Berlin, and the Berlin Institute of Health (BIH) Berlin Germany
6. Deutsches Rheuma‐Forschungszentrum (DRFZ Berlin)—a Leibniz Institute Autoimmunology Group Berlin Germany
7. Cell Therapy and Transfusion Medicine Unit Careggi University Hospital Florence Italy
8. Unit of Hematology and Bone Marrow Transplantation, IRCCS San Raffaele Scientific Hospital Vita‐Salute San Raffaele University Milan Italy